add Readme

Readme.md

+## Project Information
+
+Official website: [http://www.onlyoffice.org](http://onlyoffice.org "http://www.onlyoffice.org")
+
+Code repository: [https://github.com/ONLYOFFICE/core](https://github.com/ONLYOFFICE/core "https://github.com/ONLYOFFICE/core")
+
+SaaS version: [http://www.onlyoffice.com](http://www.onlyoffice.com "http://www.onlyoffice.com")
+
+## User Feedback and Support
+
+If you have any problems with or questions about this image, please contact us through a [dev.onlyoffice.org][1].
+
+  [1]: http://dev.onlyoffice.org