Update README to list dependencies

List depencies of this plugin
Add license and gitignore

Setup initial .gitignore and add in the GPLv2.0 license information. All
files from now on should be added with a

@License GPL-2.0 <http://spdx.org/licenses/GPL-2.0>

Line in the header comments to help with SPDX license categorization
Ignore the .ep_initialized file

Looks like a plugin that has been loaded properly / initialized creates
a .ep_initilized file. Make sure we ignore those
First code base commit

Commit our initial code base. Also, make sure that the README.md has
installation and configuraiton notes in it.