[TASK] Add basic README

Author: dfeyer

README.md

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+# Flow Framework ElasticSearch Integration
+
+*supporting Elasticsearch versions 1.2.x to 1.7.x*
+
+This project connects the Flow Framework to Elasticsearch; enabling two main functionalities:
+
+* Full-Text Indexing of Doctrine Entities
+* Index configuration based on Annotations
+
+Related package:
+
+* [Flowpack.ElasticSearch.ContentRepositoryAdaptor](https://github.com/Flowpack/Flowpack.ElasticSearch.ContentRepositoryAdaptor): An adapter to support the TYPO3CR (Content Repository) 
+indexing and searching
+
+More documentation:
+
+* [General Documentation](Documentation/Index.rst)
+* [How to index your own model ?](Documentation/Indexer.rst)