added feature posting
added markdown with pygment for code snippets

-also added temporary styles for layout
changed notifications rendering method
locked gemfile
added round borders
removed main
added fabricator gem
fixed posting feature
added fabrication gem
created and added tests for comments and posts

- also made small changes to stylesheet file
removed condition for showing comment form

-added placeholder for comment
added tests for commenting

-removed label field for comments
-removed erronated expectation
added placeholders and removed labels
extracted error messages output in shared folder
added cancan authorization gem
added and tested helper method admi? on user
added cancan ability for Post and Comment models

- defined manage all ability for admin
- defined manage Comment and read Post ability for users
- defined read for all