ENH Add SUPPORT markdown file

Author: jrleeman

SUPPORT.md

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+# Support
+
+We want to help you use MetPy and solve any challenges you encounter. There
+are many ways to contact us:
+
+## Help using MetPy
+Need some help using MetPy to solve your problem?
+* [Gitter Chatroom](https://gitter.im/Unidata/MetPy)
+* [Unidata Python User’s Mailing List](https://www.unidata.ucar.edu/support/#mailinglists)
+* [MetPy on Twitter](https://twitter.com/MetPy)
+
+## Issues
+Find a problem with MetPy? Looking for a feature we don't have? File an issue!
+* [Issue Tracker (GitHub)](https://github.com/Unidata/MetPy/issues)