Add documents

doc/HiDPI.txt

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+https://www.linuxuprising.com/2019/04/how-to-enable-hidpi-fractional-scaling.html
+
+Wayland
+gsettings set org.gnome.mutter experimental-features "['scale-monitor-framebuffer']"
+
+X11
+gsettings set org.gnome.mutter experimental-features "['x11-randr-fractional-scaling']"
+
+remove
+gsettings reset org.gnome.mutter experimental-features

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>
+```

doc/shortcats.md

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+```
+New Tab ........... Shift Ctrl T
+Close Tab ......... Shift Ctrl W
+Copy .............. Shift Ctrl C
+Paste ............. Shift Ctrl V
+Prevoius Tab ...... Ctrl PgUp
+Next Tab .......... Ctrl PgDn
+Move Tab Left ..... Shift Ctrl PgUp
+Move Tab Right .... Shift Ctrl PgDn
+Switch To Tab ..... Alt <Number>
+Scroll PgUp ....... Shift PgUp
+Scroll PgDn ....... Shift PgDn
+
+InteliJ
+Comment     Ctrl /
+Comment     Shift Ctrl /
+Back        Shilft Alt Left
+Forward     Shift Alt Right
+block mode  Shift Alt Insert
+```
+

doc/vpn.txt

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+https://www.ivpn.net/knowledgebase/255/Linux---Autostart-WireGuard-in-systemd.html
+
+/etc/wireguard/wg0.conf
+
+sudo systemctl enable wg-quick@wg0.service
+sudo systemctl daemon-reload
+
+sudo systemctl start wg-quick@wg0
+
+systemctl status wg-quick@wg0
+
+
+REMOVE
+
+sudo systemctl stop wg-quick@wg0
+sudo systemctl disable wg-quick@wg0.service
+sudo rm -i /etc/systemd/system/wg-quick@wg0*
+sudo systemctl daemon-reload
+sudo systemctl reset-failed