First staging deploy of co-curation backend

Author: ShishKabab

firebase/database.rules.json

@@ -19,6 +19,26 @@
           }
         }
       }
+    },
+    "userMessages": {
+      "$user_id": {
+        ".read": "auth != null && $user_id == auth.uid",
+        ".write": "auth != null && $user_id == auth.uid",
+        "$message_id": {
+          ".indexOn": [
+            "timestamp"
+          ],
+          "timestamp": {
+            ".validate": "newData.val() == now"
+          },
+          "message": {
+            ".validate": true
+          },
+          "$other": {
+            ".validate": false
+          }
+        }
+      }
     }
   }
 }