Added a class header for style

Added class header for font properties
 color: rgb(23,152,102)
font-family: sans-serif
Added instant variables (to be edited for correct association)

Added instant variable @user and @post to display them on groups show.
Proper associations are pending and code incontrollers for joint model
remaining
Visual changes

added class container,
changed font size and color,
added button
visual changes

Added class like container, form-control, form-group, btn etc
Added Dsecription, members, posts + Visual changes

Added grid system
Proper association is to be done. ie currently all members and all posts
are shown, but should be edited to show only members and posts
associated to the group