Merge pull request #9 from KoustavDeveloper/main

Create README.md

Weather API Documentation/README.md

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+# Weather API Documentation
+
+## Overview
+The Weather API allows developers to access real-time weather data and forecasts for cities around the globe. It provides data such as temperature, humidity, wind speed, and weather conditions. Use this API to build weather-based applications, dashboards, or integrations.
+
+### Use Cases:
+- Display real-time weather information on websites or mobile apps.
+- Integrate weather data into smart home applications.
+- Use weather forecasts for logistics and planning applications.
+
+### Versioning
+- **Current Version**: v1.0
+
+---
+
+## Authentication/Authorization
+
+To interact with the Weather API, you must authenticate your requests. The API uses **API keys** for authentication.
+
+### Requesting an API Key
+1. Sign up at [weatherapi.example.com/signup](#) to get your free API key.
+2. After signing up, you can find your API key on your dashboard.
+
+### Authorization Header Example:
+Include the API key in the header of your request as shown below:
+
+```bash
+curl -X GET "https://api.weatherapi.com/v1/current" \
+-H "Authorization: Bearer your_api_key"
+```
+
+---
+
+## Available Endpoints
+
+### Endpoint Overview
+| Endpoint                         | Method | Description                          |
+|-----------------------------------|--------|--------------------------------------|
+| `/v1/current/{city}`              | GET    | Retrieve current weather for a city  |
+| `/v1/forecast/{city}`             | GET    | Retrieve weather forecast for a city |
+| `/v1/search`                      | GET    | Search for cities by name            |
+
+---
+
+### Endpoint Details
+
+#### `GET /v1/current/{city}`
+**Description**: Retrieve the current weather conditions for a specific city.
+
+- **Method**: GET
+- **Path Parameter**: 
+  - `city` (string, required): The name of the city for which to retrieve the weather.
+- **Response**:
+  - `200 OK`: Weather data returned successfully.
+  - `404 Not Found`: City not found.
+
+**Example Request**:
+```bash
+curl -X GET "https://api.weatherapi.com/v1/current/london" \
+-H "Authorization: Bearer your_api_key"
+```
+
+**Example Response**:
+```json
+{
+  "city": "London",
+  "temperature": 15,
+  "units": "Celsius",
+  "humidity": 70,
+  "wind_speed": 5,
+  "condition": "Partly Cloudy"
+}
+```
+
+---
+
+#### `GET /v1/forecast/{city}`
+**Description**: Retrieve a 7-day weather forecast for a specific city.
+
+- **Method**: GET
+- **Path Parameter**:
+  - `city` (string, required): The city name for which to retrieve the forecast.
+- **Query Parameter**:
+  - `days` (integer, optional): Number of days for the forecast (default: 7).
+- **Response**:
+  - `200 OK`: Forecast data returned successfully.
+  - `404 Not Found`: City not found.
+
+**Example Request**:
+```bash
+curl -X GET "https://api.weatherapi.com/v1/forecast/london?days=5" \
+-H "Authorization: Bearer your_api_key"
+```
+
+**Example Response**:
+```json
+{
+  "city": "London",
+  "forecast": [
+    {
+      "date": "2024-10-06",
+      "temperature": {
+        "min": 12,
+        "max": 18
+      },
+      "condition": "Rainy"
+    },
+    {
+      "date": "2024-10-07",
+      "temperature": {
+        "min": 10,
+        "max": 16
+      },
+      "condition": "Cloudy"
+    }
+  ]
+}
+```
+
+---
+
+#### `GET /v1/search`
+**Description**: Search for cities by name.
+
+- **Method**: GET
+- **Query Parameters**:
+  - `q` (string, required): Search term (city name).
+- **Response**:
+  - `200 OK`: List of matching cities returned.
+
+**Example Request**:
+```bash
+curl -X GET "https://api.weatherapi.com/v1/search?q=london" \
+-H "Authorization: Bearer your_api_key"
+```
+
+**Example Response**:
+```json
+[
+  {
+    "city": "London",
+    "country": "United Kingdom"
+  },
+  {
+    "city": "London",
+    "country": "Canada"
+  }
+]
+```
+
+---
+
+## Error Handling and Status Codes
+
+The API uses standard HTTP response codes to indicate the success or failure of an API request.
+
+### Standard HTTP Status Codes
+- `200 OK`: The request was successful, and the data is returned in the response.
+- `400 Bad Request`: The request was malformed or invalid.
+- `401 Unauthorized`: Invalid or missing API key.
+- `404 Not Found`: The requested resource (e.g., city) could not be found.
+- `429 Too Many Requests`: You have exceeded the API rate limit.
+- `500 Internal Server Error`: A server error occurred. Retry your request later.
+
+### Custom Error Codes
+| Error Code | Description               |
+|------------|---------------------------|
+| `1001`     | Invalid API key            |
+| `1002`     | Exceeded rate limit        |
+| `1003`     | City not found             |
+
+---
+
+## Rate Limits and Quotas
+
+To prevent abuse, the API enforces rate limits based on your plan.
+
+- **Rate Limit**: 100 requests per minute.
+- **Throttling Behavior**: If you exceed the rate limit, you will receive a `429 Too Many Requests` error.
+
+### Monitoring Usage:
+You can monitor your usage and remaining quota through your [API dashboard](#).
+
+---
+
+## API Versioning
+
+The Weather API follows a versioning strategy to ensure backward compatibility.
+
+### Version Strategy:
+- The version is defined by the URI (e.g., `/v1/` for version 1).
+
+### Changelog:
+- **v1.0**: Initial release.
+
+### Migration Guide:
+If breaking changes occur, please refer to the [Migration Guide](#).
+
+---
+
+## Code Snippets
+
+### Python Example:
+```python
+import requests
+
+url = "https://api.weatherapi.com/v1/current/london"
+headers = {"Authorization": "Bearer your_api_key"}
+
+response = requests.get(url, headers=headers)
+print(response.json())
+```
+
+### JavaScript Example (Node.js):
+```javascript
+const axios = require('axios');
+
+axios.get('https://api.weatherapi.com/v1/current/london', {
+  headers: {
+    Authorization: 'Bearer your_api_key'
+  }
+}).then(response => {
+  console.log(response.data);
+}).catch(error => {
+  console.error(error);
+});
+```
+
+### Curl Example:
+```bash
+curl -X GET "https://api.weatherapi.com/v1/current/london" \
+-H "Authorization: Bearer your_api_key"
+```
+
+---
+
+## SDKs and Libraries
+
+We provide SDKs for multiple programming languages to simplify integration with the Weather API.
+
+- [Python SDK](#)
+- [JavaScript SDK](#)
+
+Refer to the SDK documentation for installation instructions and usage examples.
+
+---
+
+## Testing and Interactive Tools
+
+You can test the Weather API in our interactive [API Explorer](#) or download our [Postman Collection](#) to test the endpoints locally.
+
+---
+
+## Best Practices
+
+- **Efficient Data Retrieval**: Use caching to reduce the number of API calls for frequently requested cities.
+- **Error Handling**: Implement retry logic for `500` errors and handle rate limit errors (`429 Too Many Requests`).
+- **Security**: Always use HTTPS to secure API requests and never expose your API key in client-side code.
+
+---
+
+## Glossary
+
+- **OAuth**: An open standard for access delegation used for token-based authentication.
+- **Rate Limits**: The number of API calls allowed within a specific time period (e.g., per minute).
+- **Forecast**: A prediction of future weather conditions based on data models.
+
+---
+
+## Appendix
+
+- **Further Reading**: [Google’s API Design Guide](https://cloud.google.com/apis/design)
+- **Related APIs**: [Air Quality API](https://openweathermap.org/api/air-pollution)
+
+---