docs: add contribution guidelines (#202)

* docs: initial version of contribution guidelines

Signed-off-by: Max SCHMELLER <max.schmeller@tier4.jp>

* chore(clang-tidy): add .clang-tidy file mirrored from Autoware

Signed-off-by: Max SCHMELLER <max.schmeller@tier4.jp>

* docs(contribute.md): add instructions for clang-tidy

Signed-off-by: Max SCHMELLER <max.schmeller@tier4.jp>

* docs: apply @drwnz's suggestions a.k.a @mojomex's English spelling lessons continue

Co-authored-by: David Wong <33114676+drwnz@users.noreply.github.com>

* ci(pre-commit): autofix

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Signed-off-by: Max SCHMELLER <max.schmeller@tier4.jp>
Co-authored-by: David Wong <33114676+drwnz@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>