Add a doc with suggested learning and UI options for git

Author: npwalker

docs/git_learning_materials.md

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+# Git Learning
+
+There are lots of ways to learn git, here are some suggestions.  If you want to read about git and/or watch some videos start in the non-interactive section.  If you prefer to play with actual commands to learn then start in the interactive section.
+
+# Different Learning Options
+
+## Interactive:
+The first two start out in the web browser then git immersion helps you setup git on your machine and walk through examples on your actual machine.
+
+https://www.codecademy.com/learn/learn-git
+
+https://www.codeschool.com/paths/git
+
+http://gitimmersion.com/
+
+My favorite web tool for being able to mentally visualize what happens when you run different git commands.
+http://pcottle.github.io/learnGitBranching/
+
+## Non-Interactive:
+https://www.git-tower.com/learn/git/ebook/command-line/introduction
+https://www.git-tower.com/learn/git/videos#episodes
+
+## Cheat Sheets:
+https://www.git-tower.com/learn/cheat-sheets/git
+http://rogerdudler.github.io/git-guide/files/git_cheat_sheet.pdf
+https://training.github.com/kit/downloads/github-git-cheat-sheet.pdf
+
+## Git Tools and UIs:
+
+### GitUp
+If you have a Mac you can run GitUp which provides a visual representation of your repository as well as quick ways to do some more complicated command line commands.
+http://gitup.co/
+
+### SourceTree:
+SourceTree has the advantage of working on windows and Mac.  You have to make an Atlassian account to use it for free past 30 days but it is free.
+https://www.sourcetreeapp.com/
+
+### GitKraken:
+This looks like it will be a nice free tool, but I’m waiting on an invite.
+http://www.gitkraken.com/
+
+## Reference Material:
+https://git-scm.com/book/en/v2