add readme

README.md

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+# discourse-mozilla-theme
+
+*Theme used on discourse.mozilla.org*
+
+## Bug reports
+
+Bug reports should be filed [by following the process described here](https://discourse.mozilla.org/t/where-do-i-file-bug-reports-about-discourse/32078).
+
+## Licence
+
+[MPL 2.0](https://www.mozilla.org/MPL/2.0/)