Add README

Author: thebaer

README.md

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+# java-writeas
+
+Official Write.as Java client library.
+
+## Uses
+
+This is a shared library used between Android apps that interact with the Write.as API. It currently holds only data models.
+
+## Contributing
+
+The library covers our usage, but might not cover the entire API. We always welcome contributions and improvements from the community. Before sending pull requests, please be sure you've done the following:
+
+* Document all classes and methods.