merge
corrected share options
created User class
added firebase to gradle
added firebase connection to main activity
added activity for user account
added fragment for sign up or log in
added fragment for user log in and refactored fragment for user sign up
refactored fragments for user
added string resources for user account
layout for user selection
Adding in the email contacts sharing
layouts for user fragments
Merge pull request #37 from KateCatlin/master

Adding in the email contacts selector
layouts for user fragments
merge conflict
merge conflict
redo of layout for login
added optional activity start to main. added UI to userSignUp
add shared pref for username