Merge pull request #1 from EmmaDeacon/express-cheatsheet

Compiles Express Node Workshop Keywords

express-cheatsheet.md

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+| Keyword | Explanation |
+|--------|:-------------------------------:|
+| client | A client requests services and information from the server. Typically, a client is a computer application, such as a web browser. |
+| dependencies | Dependencies are external code modules that are required to run your project. |
+| endpoint | The part of the URL which comes after `/`. For example: `/chocolate` is the "chocolate" endpoint. |
+| `express.static()` | The built-in Express middleware function that makes it possible to serve static assets. |
+| `get()` | The Express method used to set up a handler function in Express. Takes two parameters: the endpoint, and the handler function. |
+| handler function | A function that receives requests and tells the server how to respond to them. |
+| method | Method is another name for a function. |
+| middleware | A function (or functions) that are invoked by Express before your final request handler is executed. Middleware sits between a raw request and its final intended route. |
+| module | A module is a bit of reusable code, written by you or someone else, that can be imported into a Node.js project using require. |
+| npm | npm is a "package manager" for Node.js, meaning it allows you to easily install external modules (or chunks of code) published by others and use them in your project. |
+| `npm install [package-name]` | The terminal command used to install a package from npm. |
+| `package.json` | A `package.json` is the file used to store information about a Node.js project, such as its name and its dependencies. Read more [here](http://browsenpm.org/package.json). |
+| port | A port is a number that serves as an endpoint, determining where you can access your web application. |
+| request | A request is the message sent via HTTP from the client to the server, asking for information. |
+| `require()` | Require is used in Node.js to import functionality from another file or an external module. |
+| response | A response is the data sent back to the client from the server after an HTTP request is made. |
+| routing | The definition of application endpoints and how they respond to client requests. |
+| `--save` | When added to the end of an `npm install` command, `--save` adds that npm package to the `package.json` file. |
+| `send()` | The Express method used to send information back to the client from the server. Updates the response object. |
+| server | A web server is a software application which handles HTTP requests sent by the client, like web browsers, and returns web pages and information in response. |
+| static assets | Files such as HTML, CSS and JavaScript documents or images that you want to appear in the browser. |
+| `use()` | The method that tells Express to use a certain piece of middleware. |