Depended queries support added

packages/fl_query/lib/src/models/query_job.dart

@@ -1,5 +1,22 @@
 import 'package:fl_query/src/query.dart';
 
+/// How to make dependent Queries?
+///
+/// Pass a [QueryBowl] class/object to [task] that contains a method
+/// [QueryBowl.dependOnQuery] that takes a [QueryJob] and uses that to get
+/// the appropriate query for it or if it doesn't exist creates a new
+/// instance. It listens to the changes of [Query] of the passed
+/// [QueryJob] & calls the [notifyListener] method of running [Query]
+///
+/// If shown briefly
+///
+/// ```data
+/// task: (queryKey, external, queryBowl){
+/// final dependentQuery = queryBowl.dependOnQuery(dependentQueryJob);
+/// return someAsyncTask();
+/// }
+/// ```
+
 class QueryJob<T extends Object, Outside> {
   // all params
   String _queryKey;