Issue #2318669 by slashrsm: Add README.md and DEVELOPING.md.

DEVELOPING.md

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+# Developing
+
+* Issues should be filed at http://drupal.org/project/issues/entity_browser
+* Pull requests can be made against https://github.com/drupal-media/entity_browser/pulls

README.md

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+# Entity Browser Module [![Build Status](https://travis-ci.org/drupal-media/entity_browser.svg?branch=8.x-1.x)](https://travis-ci.org/drupal-media/entity_browser)
+
+Provides standardized interface to list, create and select entities.
+
+## Requirements
+
+* Latest dev release of Drupal 8.x.
+
+## Configuration
+
+No functionality can be tested ATM. Module is still under heavy development.
+
+## Technical details
+
+Architecture details can be found on [architecture meta-issue.](https://www.drupal.org/node/2289821).