Rebase tooling_clang_tidy to develop and updated README

[solomonjoseph]

Description

This PR works on issue #63 by creating a target for clang-tidy checks. A python script is downloaded into the build folder via a Cmake script in clang-tidy.cmake. Parameters for the clang-tidy checks can be specified in the .clang-tidy file (eg. which checks to run, warnings as errors, etc).

closes: N/A

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• [X ] Targeted PR against correct branch (develop)
• [X ] Linked to Github issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• [n/a] Wrote unit tests
• [X ] Updated relevant documentation in the code
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

[ValarDragon]

Works on my machine! Thanks for the PR