Added README

Author: JasonTheAdams

README.md

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+# WP REST API PSR-7
+WP REST API PSR-7 is a small library which creates a bridge between the PSR-7 standards and interfaces and the WordPress REST API Response and Request classes. You can include it via composer in any theme or plugin which needs this.
+
+## More Detail
+Development for the WordPress REST API started before the [PSR-7](https://www.php-fig.org/psr/psr-7/) was finalized. This standard made a great way for different libraries to be able to interact using a common interface. Unfortunately, since WordPress missed it, the standard [WP_REST_Request](https://developer.wordpress.org/reference/classes/wp_rest_request/) and [WP_REST_Response](https://developer.wordpress.org/reference/classes/wp_rest_response/) classes are not PSR-7 compliant.
+
+This means that any library which extends HTTP Messages using the PSR-7 standard are not compatible with WordPress by default. Bummer! Our team ran into this limitation when attempting to use the [OAuth2 Server](https://github.com/thephpleague/oauth2-server) library.
+
+## When would I need this?
+This is the sort of thing where you don't need it until you do and when you do you'll know it's missing. 🙂