Added README

Author: pborissow

README.md

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+# JavaXT Exchange
+The javaxt-exchange library is used to retrieve, create, edit, and delete Email Messages, Contacts, and Calendar Events hosted on a Microsoft Exchange Server. 
+
+## Project homepage
+Information about the javaxt-exchange library, documentation, and releases can be found on the project homepage:
+ - <a href="https://www.javaxt.com/javaxt-exchange/">https://www.javaxt.com/javaxt-exchange/</a>
+
+## License
+All JavaXT libraries are free and open source released under a permissive MIT license. This software comes with no guarantees or warranties. You may use this software in any open source or commercial project.