gistfile1.txt

{
  "rules": {
    ".read": false,
    ".write": "auth != null",
      "groups" : {
        ".write": false,
        ".read" : true,
        "$project_id" : {
          "$group_id" : {
            "completedCount" : {
              ".write": "auth != null",
            }
          },
        ".indexOn": ["distributedCount", "completedCount"]
        }
      },
      "imports" : {
        ".read" : true,
        ".write" : true
      },
     "projects" : {
        ".write": false,
        ".read" : true,
      },
    "results" : {
      ".write": false,
      ".read" : true,
        "$task_id" : {
          "$user_id" : {
          ".write": "auth != null && auth.uid == $user_id"
          }
        }
      },
      "users": {
      "$uid": {
        ".read": "auth != null && auth.uid == $uid",
        ".write": "auth != null && auth.uid == $uid",
      }
    }

      
  }
}