add endpoint for getting permissions info

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

@@ -624,3 +624,40 @@ paths:
                 401:
                     description: "Unauthorized"
 
+    /1.0/main/permissions/info.json:
+        post:
+            tags:
+                - permissions
+            summary: Return info about permissions on entity
+            responses:
+                200:
+                    description: "ok"
+                401:
+                    description: "Unauthorized"
+                400:
+                    description: "Bad request"
+            requestBody:
+                required: true
+                content:
+                    application/json:
+                        schema:
+                            type: object
+                            properties:
+                                object:
+                                    type: object
+                                class:
+                                    type: string
+                                roles:
+                                    type: array
+                                    items:
+                                        type: string
+                        examples:
+                            an-accompanying-period:
+                                value:
+                                    object:
+                                        type: accompanying_period
+                                        id: 1
+                                    class: 'Chill\PersonBundle\Entity\AccompanyingPeriod'
+                                    roles:
+                                        - 'CHILL_PERSON_ACCOMPANYING_PERIOD_SEE'
+