Add readme

Author: lindyhopchris

README.md

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+## Description
+
+Extension for [neomerx/json-api](https://github.com/neomerx/json-api) that adds HTML Request Body content validation.
+
+## Why?
+
+PHP provides `json_decode` to decode a provided JSON string. However, the JSON API spec describes how the request
+JSON should be *semantically* correct. E.g. when a client is providing a resource object for a create request, the
+`attributes` member must be an object.
+
+This package provides framework agnostic validation of the received request body content - so that it can be handled
+knowing that not only has `json_decode` successfully run, but that the structure of the decoded JSON is as expected. 
+Provided decoders also returns decoded content as `StandardObject` instances, an object that provides a number of 
+helper methods for handling the decoded content e.g. within a controller.
+
+## Status
+
+This repository is under active development and is currently in a pre-release state.
+
+## License
+
+Apache License (Version 2.0). Please see [License File](LICENSE) for more information.