Create README.md

Added new introductory readme file.

Author: samtuke

README.md

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+# phplist-plugin-restapi
+### REST API plugins for phpList
+
+This repository contains two separate API plugins for phpList, the REST API Plugin v1 and v2. 
+
+v1 is no longer maintained and, while functional, should be considered depreciated.
+v2 is under active development and should be used and extended where possible.
+
+Both plugins are contained within the `plugins` folder, along with respective documentation and plugin-specific tests.