Improve the main README
Improve the main README

GitOrigin-RevId: 3c9a4576201c9bb9d59c414a2caf804b29237932
Change-Id: I318b3febb5a44e9fc2ab19ae1a6566c1dbd2346b

google/differential-privacy,google/differential-privacy,google/differential-privacy,google/differential-privacy,google/differential-privacy