Add an issue and a PR template

Author: bbatsov

.github/ISSUE_TEMPLATE.md

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+*Use the template below when reporting bugs. Please, make sure that
+you're running the latest stable clojure-mode and that the problem you're reporting
+hasn't been reported (and potentially fixed) already.*
+
+**Remove all of the placeholder text in your final report!**
+
+## Expected behavior
+
+## Actual behavior
+
+## Steps to reproduce the problem
+
+*This is extremely important! Providing us with a reliable way to reproduce
+a problem will expedite its solution.*
+
+## Environment & Version information
+
+### clojure-mode version information
+
+*Include here the version string displayed by `M-x
+clojure-mode-display-version`. Here's an example:*
+
+```
+clojure-mode (version 5.2.0)
+```
+
+### Emacs version
+
+*E.g. 24.5* (use <kbd>C-h C-a</kbd> to see it)
+
+### Operating system
+
+*E.g. Windows 10*

.github/PULL_REQUEST_TEMPLATE.md

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+Before submitting a PR make sure the following things have been done (and denote this
+by checking the relevant checkboxes):
+
+- [ ] The commits are consistent with our [contribution guidelines](../CONTRIBUTING.md)
+- [ ] You've added tests (if possible) to cover your change(s). Indentation & font-lock tests are extremely important!
+- [ ] All tests are passing (`make test`)
+- [ ] The new code is not generating bytecode or `M-x checkdoc` warnings
+- [ ] You've updated the changelog (if adding/changing user-visible functionality)
+- [ ] You've updated the readme (if adding/changing user-visible functionality)
+
+Thanks!