[API] Adiciona erro de entidade não processada

Api/Competition.yaml

@@ -50,6 +50,9 @@ paths:
         '500':
           $ref: >-
             https://gitlab.dev.evologica.com.br/Competify/Docs/raw/master/Api/components/responses.yaml/#/InternalServerError
+        '422':
+          $ref: >-
+            https://gitlab.dev.evologica.com.br/Competify/Docs/raw/master/Api/components/responses.yaml/#/UnprocessableEntityError
   '/competifier/messages':
     parameters:
       - $ref: https://gitlab.dev.evologica.com.br/Competify/Docs/raw/master/Api/components/parameters.yaml/#/language

Api/components/responses.yaml

@@ -24,3 +24,21 @@ InternalServerError:
             type: string
           completeMessage:
             type: string
+UnprocessableEntityError:
+  description: ''
+  content:
+    application/json:
+      schema:
+        type: object
+        properties:
+          code:
+            type: integer
+          entities:
+            type: array
+            items:
+              type: object
+              properties:
+                oid:
+                  type: integer
+                message:
+                  type: string