fix: add issue templates

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 46.11%. Comparing base (345cdee) to head (7223599). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #413 +/- ## ========================================= Coverage 46.11% 46.11% Complexity 397 397 ========================================= Files 187 187 Lines 2084 2084 Branches 110 110 ========================================= Hits 961 961 Misses 1089 1089 Partials 34 34 ``` | [Flag](https://app.codecov.io/gh/Miragon/miranum/pull/413/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Miragon/miranum/pull/413/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | `46.11% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon#carryforward-flags-in-the-pull-request-comment) to find out more.

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