Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+## Suggest
+
+If you have idea/feature, you can [open an issue](https://github.com/captaincolonelfox/TeleTok/issues/new)
+or [start a discussion](https://github.com/captaincolonelfox/TeleTok/discussions) and I
+can try to implement it in my spare time
+
+## Code
+
+Or you can implement it yourself and [open a pull request](https://github.com/captaincolonelfox/TeleTok/pulls), though
+maybe you want to [discuss](https://github.com/captaincolonelfox/TeleTok/discussions) the feature first
+
+### Installing with dev dependencies
+
+```shell
+pip install -e ".[dev]"
+```
+
+### Checks before commit
+
+Run those checks before commit
+
+And test again, if you changed code to fix anything they find
+
+If you are not sure, if you should implement suggested fix or not:
+sometime we want to ignore some rules, not all of them are helpful, so just ask and we can discuss it
+
+- linter
+
+```shell
+ruff check app
+```
+
+- typing
+
+```shell
+mypy app
+```
+
+- formatter
+
+```shell
+black --check app
+```
+