Add issue template and move supported files to .github

.github/CONTRIBUTING.md

@@ -13,7 +13,7 @@ https://groups.google.com/forum/#!forum/zxing
 
 ### Feature Requests
 
-Feature requests are generally not accepted and may be closed if nobody acts on them.
+Feature requests are not accepted and will generally be closed.
 Feature requests with a pull request may be accepted. When in doubt, discuss on the
 mailing list first.
 

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,29 @@
+(Please remove this text once you've read and understood it.)
+
+## Contributing
+
+The project is in maintenance mode, meaning, changes are driven by contributed patches.
+There is otherwise no active development or roadmap for this project. It is "DIY".
+
+Only proposed changes in the form of a pull request are likely to be acted on, but,
+these will be acted on promptly.
+
+### Questions
+
+Questions should be asked on the mailing list:
+https://groups.google.com/forum/#!forum/zxing
+
+### Feature Requests
+
+Feature requests are not accepted and will generally be closed.
+Feature requests with a pull request may be accepted. When in doubt, discuss on the
+mailing list first.
+
+### Bug Reports
+
+Bug reports must have enough detail to understand and reproduce the problem. Inadequate
+bug reports will be closed with a request for more information.
+
+Bug reports without an associated pull request are not likely to be addressed, but will be
+left open for some time to see if anyone can contribute a solution. However, bug reports
+with a pull request are likely to be merged promptly.