added postman collection for application api testing and demo

TC for Java.postman_collection.json

@@ -0,0 +1,99 @@
+{
+	"info": {
+		"_postman_id": "9470b311-46f1-47b7-aa30-1bec07890777",
+		"name": "TC for Java",
+		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+	},
+	"item": [
+		{
+			"name": "Create a product",
+			"request": {
+				"method": "POST",
+				"header": [
+					{
+						"key": "Content-Type",
+						"value": "application/json",
+						"type": "text"
+					}
+				],
+				"body": {
+					"mode": "raw",
+					"raw": "{\n\"code\": \"P201\",\n\"name\": \"Product P201\",\n\"description\": \"Product P201 description\",\n\"price\": 24.0\n}",
+					"options": {
+						"raw": {}
+					}
+				},
+				"url": {
+					"raw": "http://localhost:8080/api/products",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"api",
+						"products"
+					]
+				}
+			},
+			"response": []
+		},
+		{
+			"name": "Upload Product Image",
+			"request": {
+				"method": "POST",
+				"header": [],
+				"body": {
+					"mode": "formdata",
+					"formdata": [
+						{
+							"key": "file",
+							"type": "file",
+							"src": "/Users/user/image.png"
+						}
+					],
+					"options": {
+						"formdata": {}
+					}
+				},
+				"url": {
+					"raw": "http://localhost:8080/api/products/P101/image",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"api",
+						"products",
+						"P101",
+						"image"
+					]
+				}
+			},
+			"response": []
+		},
+		{
+			"name": "Get a product by code",
+			"request": {
+				"method": "GET",
+				"header": [],
+				"url": {
+					"raw": "http://localhost:8080/api/products/P201",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"api",
+						"products",
+						"P201"
+					]
+				}
+			},
+			"response": []
+		}
+	],
+	"protocolProfileBehavior": {}
+}