Update contributing guideline to add a note about detailed coverage.
Update contributing guideline to add a note about detailed coverage.

manshar/manshar,ahmgeek/manshar,manshar/manshar,mjalajel/manshar,ahmgeek/manshar,RashaHussein/manshar,ahmgeek/manshar,mjalajel/manshar,ahmgeek/manshar,mjalajel/manshar,RashaHussein/manshar,manshar/manshar,RashaHussein/manshar,RashaHussein/manshar,manshar/manshar,mjalajel/manshar