add git notes

git.md

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+
+Branches
+============================================
+
+
+### Adding Branches ###
+* local: `git checkout -b <branch>`
+* remote: `git push --set-upstream <remote> <branch>`
+* track remote: `git checkout --track <origin>/<branch>`
+
+### Deleting Branches ###
+
+* local: `git branch -d <name>`
+* remote: `git push -d <remote> <name>`
+* realize remote deletes: `git remote prune  <remote>`
+
+### Non-Standard Activities ###
+
+* merge only a single file into another branch `git checkout <branch> -- <file>`
+* do not track `git rm <file>`