documentation: add build and license information

The build instructions are in Build.html. The license information
is in README.txt

Bug 2016368

Change-Id: I7122389ac3d438aa82b96a88e4fa3c19c966a326
Reviewed-on: https://git-master.nvidia.com/r/1601849
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Bo Yan <byan@nvidia.com>
Tested-by: Bo Yan <byan@nvidia.com>
4 files changed