Add documents

doc/git.md

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+```bash
+# How to Write a Git Commit Message
+# https://chris.beams.io/posts/git-commit/
+
+GIT_PROMPT_ONLY_IN_REPO=1
+source $HOME/.bash-git-prompt/gitprompt.sh
+
+# start nove lokalni vetve
+git checkout -b new_branch
+# start lokalni vetve navazanou na remote
+git checkout -b serverfix origin/serverfix
+
+# tracking branch
+git branch -u origin/serverfix
+git branch --set-upstream-to origin/serverfix
+
+# delete local branch
+git branch -d mbl/test
+# delete remote branch
+git push origin --delete mbl/test
+# fetch with delete remote links
+git fetch -p
+
+git reflog show
+
+git log --oneline
+
+# fixup
+git commit --fixup fb2f677
+git fetch origin
+git rebase -i --autosquash origin/master
+git push -f origin mbl/first-touch
+
+# prepsani hlasek a podobne
+git rebase -i origin/master
+
+# revert git add
+git reset
+
+# undo last commit
+git reset --soft HEAD~1
+
+# unstage 
+git reset HEAD
+
+# reset to master
+git reset --hard origin/master 
+
+----------------------------------------------------------
+git rebase -i -origin/master
+# u daneho commitu nastavit "edit"
+# reset na predeslou verzi
+git reset HEAD^
+# proved veskere dilci commity
+git rebase --continue
+
+# pouzije comment z jineho commitu
+commit -pc <commit-hash>
+```