v1.0.1 - Fix private custom post types bug

Merge pull request #1 from harryfinn/bugfix/disable-hidden-post-types

Fix issue whereby Yoast SEO scripts were called for private CPT's

Initial Release

Initial Commit

* Adds `README.md` with basic information about plugin, installation,
usage and version support

* Adds PHP plugin class to initialize `js` file in correct section of
admin along with ensuring that both `Yoast SEO` and `CMB2` are running
as part of the WordPress instance

* Adds `js` class which utilises the `YoastSEO` js adapter to handle
the recalculation of SEO content scores on content pages