Create README.md

initial overview
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added details
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Merge branch 'master' of github.com:OfficeDev/Office-365-SDK-for-Android

# By Roopali
# Via Roopali
* 'master' of github.com:OfficeDev/Office-365-SDK-for-Android:
  Update README.md
  Update README.md
  Update README.md
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  Create README.md
directory rename
directory rename
deleting old folder
Removed unused class
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asse-management comments
Merge branch 'master' of github.com:OfficeDev/Office-365-SDK-for-Android

# By Roopali (2) and Pablo Zaidenvoren (1)
# Via Roopali
* 'master' of github.com:OfficeDev/Office-365-SDK-for-Android:
  Update README.md
  Update README.md
  Removed unused class
Update README.md
Added mail-calendar-contact SDK.