Initial commit for appium-clj

- Builds iOS project.
- Utility functions for executing shell commands.
- Runs Appium queries on iOS devices

Reference: https://github.com/kapilreddy/calabash-clj
Change-Id: I0a1f504efad9002d1d600f1fdce6999275247451
Update README to include USAGE section

Change-Id: Ib7df4f21b73501d3255297f59ce8e6c8c038d658