Authentication added making it a completely functional project#1

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usman18 wants to merge 5 commits intoShashank02051997:masterfrom

Commits on Jul 4, 2019

Firebase, git ignore setup
usman18
committed
Migrated to Android X
usman18
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Variables converted to private, camelcase notations used
usman18
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Firebase authentication successful
usman18
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Progress bar added to show loading
usman18
committed