Summary: Improve the README giving an overview of the project and why it was needed. Also add the MIT licence since we are going to open source the plugin and credit the orginal author the Harbormaster files we are using. Also updated the TeamCity build definition to include build number in the plugin output file.
Test Plan:
Packaged locally to verify the version number is included in the plugin zip.
Other changes were text in the README and LICENCE
Reviewers: #dev, rob.marshall
Reviewed By: #dev, rob.marshall
Subscribers: rob.marshall
Differential Revision: https://phab.xlab.uk/D2704
