add github templates for issues and pull requests

.github/ISSUE_TEMPLATE.md

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+ _If this is a bug report, please fill in the following sections.
+If this is a feature request, delete and describe what you would like with examples._
+
+## What was wrong?
+
+### Code that produced the error
+
+```py
+CODE_TO_REPRODUCE 
+```
+
+### Full error output 
+
+```sh
+ERROR_HERE 
+```
+
+### Expected Result
+
+_This section may be deleted if the expectation is "don't crash"._
+
+```sh
+EXPECTED_RESULT
+``` 
+
+### Environment
+
+```sh
+# run this:
+$ python -m eth_utils
+
+# then copy the output here:
+OUTPUT_HERE
+``` 
+
+## How can it be fixed?
+
+Fill this section in if you know how this could or should be fixed.

.github/PULL_REQUEST_TEMPLATE.md

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+## What was wrong?
+
+Issue #
+
+## How was it fixed?
+
+Summary of approach.
+
+#### Cute Animal Picture
+
+![put a cute animal picture link inside the parentheses]()