Start the git guide

README.md

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+# Git workflow
+
+This document describes the git workflow that should be used when contributing
+to open source projects. It assumes a very basic understanding of git
+(commits, branches, etc.) using the command line.
+
+**Note: This workflow is designed for open source (i.e., public)
+repositories. The workflow for private repositories may be slightly different,
+in particular, the repository's team may prefer for you to not fork the repo
+but rather push branches to it directly (although note that GitHub does allow
+you to fork private repositories that you have push access to and keeps the
+fork private).**
+
+For this document, we will suppose that you want to contribute a patch to
+[conda/conda](https://github.com/conda/conda).
+
+## Cloning and forking the repository
+
+**Note: The steps in this section only need to be performed once per
+repository (i.e., if you contribute a second change to conda/conda, you would
+not need to repeat them, but if you contribute to
+[conda/conda-build](https://github.com/conda/conda-build) you will need to
+repeat them for that repository.**
+
+1. Clone the repository. Copy the url ① and type, in this case
+
+   ```
+   git clone [email protected]:conda/conda-build.git
+   ```
+
+   at the terminal. If you have not set up your ssh keys with GitHub, use the
+   https url ②.
+
+   ![clone.png](clone.png)