create user _index and _entity endpoint

src/Bundle/ChillMainBundle/chill.api.specs.yaml

@@ -10,6 +10,19 @@ servers:
 
 components:
   schemas:
+    User:
+      type: object
+      properties:
+        id:
+          type: integer
+        type:
+          type: string
+          enum:
+            - user
+        username:
+          type: string
+        text:
+          type: string
     Center:
       type: object
       properties:
@@ -425,3 +438,38 @@ paths:
           description: "not found"
         401:
           description: "Unauthorized"
+
+
+  /1.0/main/user.json:
+    get:
+      tags:
+        - user
+      summary: Return a list of all user
+      responses:
+        200:
+          description: "ok"
+  /1.0/main/user/{id}.json:
+    get:
+      tags:
+        - user
+      summary: Return a user by id
+      parameters:
+        - name: id
+          in: path
+          required: true
+          description: The user id
+          schema:
+            type: integer
+            format: integer
+            minimum: 1
+      responses:
+        200:
+          description: "ok"
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/User'
+        404:
+          description: "not found"
+        401:
+          description: "Unauthorized"