Add Hacking-Git.md

Author: chriscool

Hacking-Git.md

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+---
+layout: default
+title: Hacking Git
+---
+
+The goal of this document is not to be a tutorial but rather to point
+people to interesting material that has already been written.
+
+## Getting started
+
+* ["INSTALL"](https://github.com/git/git/blob/master/INSTALL)
+
+* ["My First Contribution"](https://git-scm.com/docs/MyFirstContribution)
+
+* ["My First Object Walk"](https://github.com/git/git/blob/master/Documentation/MyFirstObjectWalk.txt)
+
+* [Matheus' tutorial](https://matheustavares.gitlab.io/posts/first-steps-contributing-to-git)
+
+## Conventions and processes
+
+* ["CodingGuidelines"](https://github.com/git/git/blob/master/Documentation/CodingGuidelines)
+
+* ["SubmittingPatches"](https://git-scm.com/docs/SubmittingPatches/)
+
+## Debugging
+
+* [Git for Windows' Debugging Git](https://github.com/git-for-windows/git/wiki/Debugging-Git)
+
+* [Launching gdb explanations in CodingGuidelines](https://github.com/git/git/blob/master/Documentation/CodingGuidelines#L435-L439)
+
+* [Explanations by Philippe Blain](https://github.com/gitgitgadget/git/pull/582#issuecomment-599845508)
+
+## Tests
+
+* ["t/README"](https://github.com/git/git/blob/master/t/README)