Update metadata and docs

Clean up metadata and docs to make this action easier to find/read

Adds target org and space options

see http://cli.cloudfoundry.org/en-US/cf/target.html

can now add CF_TARGET_ORG and CF_TARGET_SPACE to preempt cf commands

Basic usage of cf cli

Allows for users to login via CF_ secrets and environment variables. Basic commands should work.

Feel free to file an issue for any specific use-case.