Update readme and exclude module `integration-tests` from release

[majguo]

The PR is to enhance readme by:

• add release process
• add more badges
• add instructions on deps installation for integ-tests
• add instructions on deps installation for sample apps

It also includes a commit to exclude module integration-tests from release, see this for more information.

Signed-off-by: Jianguo Ma jiangma@microsoft.com