github contributing and pull request template

(cherry picked from commit 7401efa)

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please describe your PR here.

CONTRIBUTING.md

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+# Contributing to dnspython
+
+## Reporting Issues
+
+Please start with a clear and concise description of what the bug is, and what you
+expected to happen instead.  Next, please describe in detail how to reproduce the bug.
+Making the replication steps as simple and short as possible is very helpful.  Please
+also include the requested version information.
+
+## Contributing Code
+
+For any significant change or new API, we recommend opening a Feature Request issue
+and having a discussion before coding begins.
+
+Please add tests for any code, as PRs without testing or which reduce the overall code
+test coverage may not be merged.  Code should also be formatted with "black", be typed
+(and pass type checking), and also pass the test suite.
+
+Our thanks for being a contributor!