Added Changelog.md

CHANGELOG.md

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+Change log
+==========
+
+0.9.0 (2017-04-14)
+-------------------
+
+### New features
+ 
+ - Added search by Author, all available queries are [described here](https://blog.ambar.cloud/mastering-ambar-search-queries/)
+ 
+ - Added Italian language analyzer, use `ambar-it` in `config.json` to enable it
+ 
+ - Added [API documentation](https://github.com/RD17/ambar/blob/master/API_DOC.md) to GitHub, so you can connect Ambar with other systems
+ 
+### Bugfixes
+
+ - Minor bugfixes (thanks for your feedback)