Add issue templates.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: 🐞 Bug report
+about: A problem with how pytest-cov or coverage works.
+---
+
+# Summary
+
+## Expected vs actual result
+
+# Reproducer
+
+## Versions
+
+Output of relevant packages `pip list`, `python --version`, `pytest --version` etc.
+
+Make sure you include complete output of `tox` if you use it (it will show versions of various things).
+
+## Config
+
+Include your `tox.ini`, `pytest.ini`, `.coveragerc`, `setup.cfg` or any relevant configuration.
+
+## Code
+
+Link to your repository, gist, pastebin or just paste raw code that illustrates the issue.
+
+If you paste raw code make sure you quote it, eg:
+
+```python
+def foobar():
+    pass
+```
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: ✈ Feature request
+about: Need help with configuring pytest-cov
+---
+
+Before proposing please consider:
+
+* the maintenance cost of the feature
+* implementing it externally (like a shell/python script,
+  pytest plugin or something else)
+
+# Summary
+
+These questions should be answered:
+
+* why is the feature needed?
+* what problem does it solve?
+* how it is better compared to past solution to the problem?

.github/ISSUE_TEMPLATE/support_request.md

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+---
+name: 🤔 Support request
+about: Need help with configuring pytest-cov
+---
+
+Please go over all the sections and search
+https://pytest-cov.readthedocs.io/en/latest/ or
+https://coverage.readthedocs.io/en/latest/
+before opening the issue.
+
+# Summary
+
+## Expected vs actual result
+
+# Reproducer
+
+## Versions
+
+Output of relevant packages `pip list`, `python --version`, `pytest --version` etc.
+
+Make sure you include complete output of `tox` if you use it (it will show versions of various things).
+
+## Config
+
+Include your `tox.ini`, `pytest.ini`, `.coveragerc`, `setup.cfg` or any relevant configuration.
+
+## Code
+
+Link to your repository, gist, pastebin or just paste raw code that illustrates the issue.
+
+If you paste raw code make sure you quote it, eg:
+
+```python
+def foobar():
+    pass
+```
+
+# What has been tried to solve the problem
+
+You should outline the things you tried to solve the problem but didn't work.