implemented /help route

src/test/db.json

@@ -893,6 +893,26 @@
         "user_id" : {"$oid": "000000000000000000000003"},
         "__v" : 0
       }
+    ],
+    "helps": [
+      {
+        "_id": {"$oid":"150000000000000000000001"},
+        "key": "/documentation",
+        "text": "Documentation help",
+        "level": "none"
+      },
+      {
+        "_id": {"$oid":"150000000000000000000002"},
+        "key": "/samples",
+        "text": "Samples help",
+        "level": "read"
+      },
+      {
+        "_id": {"$oid":"150000000000000000000003"},
+        "key": "/models",
+        "text": "Models help",
+        "level": "dev"
+      }
     ]
   }
 }