Added README.md to root and common-cli
Merge branch 'develop' of github.com:caskdata/common into feature/readme

Conflicts:
	common-cli/src/main/java/co/cask/common/cli/CLI.java
Fix HelloCLI and NoteCLI due to merge
Merge pull request #3 from caskdata/feature/readme

Added README.md to root and common-cli