added README to ci directory for other developers

ci/README.rst

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+The files within this folder handle the various continuous integration stuff for SHARPpy:
+
+build_docs.sh: Builds the documentation using sphinx and deploys to Github Pages
+deploy_conda.sh: Builds the conda recipe for SHARPpy and deploys to Anaconda Online
+deploy_key.enc: An encrypted key for deployment of documentation
+cscreen: a utility to modify the screen size of macOS (freeware; https://www.pyehouse.com/cscreen/)
+make_binary.sh: a script to build the macOS binary using PyInstaller
+screen.py: A Python script to print out the screen resolution to the command line
+
+