Updating membership/roles to subcollections

[styles]: update on window resize event and scroll

Fixed bug on showing users that are clicked already when looking for other users to add feature

[styles]: Fixed the output results

Updated ReadMe

Fixed filtering others users

Creating ShareBoard.js component

Fixed changed card status for comments and subtasks subcollection

Updated README

Debugged the comment and subtasks subcollection when changed boardStatus

Added fuctionalities for comment section

Updated the date of comment and created date of user

Updated Readme

Added Comment

storing subtasks to firestore