Rules.json

{
  "rules": {
    "users":{
      ".read": "auth != null && root.child('admins').child(auth.uid).val() == true",
      "$uid": {
      ".write": "auth != null && auth.uid == $uid",
      ".read": "auth != null && ( auth.uid == $uid || root.child('admins').child(auth.uid).val() == true)"
     }
    },
    "tests":{
      ".read": "auth != null",
    	".write": false,
    },
    "Results" : {
      ".read": "auth != null && root.child('admins').child(auth.uid).val() == true",
      "$child":{
        "$uid": {
      		".write": "auth != null && auth.uid == $uid &&(!data.exists() || !newData.exists())",
      		".read": "auth != null && ( auth.uid == $uid || root.child('admins').child(auth.uid).val() == true)"
     		}
      }
    },
      "admins" :{
        ".read":"auth!=null",
          ".write":"auth != null && root.child('admins').child(auth.uid).val() == true"
      }
  }
}