Add documentation

DOC.md

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+## Install dependencies
+
+```bash
+sudo apt-get install -y git xorg libx11-dev libxft-dev libxinerama-dev build-essential
+```
+
+You can install another programs for your customization. This is for the example:
+
+```bash
+sudo apt install -y pulseaudio pavucontrol pulseaudio-utils	# For volume script
+sudo apt install -y nitrogen 								# For wallpaper
+sudo apt install -y lxpolkit 								# For polkit
+sudo apt install -y xcompmgr 								# For transparent supporting
+sudo apt install -y rofi									# For menu launcher
+sudo apt install -y scrot									# For screenshot
+sudo apt install -y htop kitty thunar						# For another Apps
+```
+
+## Clone from source
+
+```bash
+git clone https://git.suckless.org/dwm ~/.dwm
+cd ~/.dwm
+```
+
+## Modification the `config.h`
+
+See `config.def.h` for a default configuration.
+
+## Compile and Install
+
+```bash
+sudo make clean install
+```
+
+## Usage
+
+### Add DWM as a Window Manager
+
+If you want to use it without Display Manager, you can use this method:
+
+Add this line on `~/.xinitrc`
+```bash
+exec dwm
+```
+
+Then you can run it with `startx`
+```bash
+startx
+```
+
+### Add DWM on X Session
+
+If you want to use a Display Manager with a semi-automatic via custom session, you can use this method:
+
+Add this line on `~/.xsession`
+```bash
+exec dwm
+```
+
+### Add DWM to Display Manager
+
+If you want to use a Display Manager with a GUI login, you can use this method:
+
+As root, create file `/usr/share/xsessions/dwm.desktop` then type this:
+```bash
+[Desktop Entry]
+Encoding=UTF-8
+Name=DWM
+Comment=Dynamic Window Manager
+Exec=dwm
+Icon=dwm
+Type=XSession
+```
+
+## Add the autostart
+
+### Use patch
+
+You can use official autostart patch method. Check the complete instruction in [here](https://dwm.suckless.org/patches/autostart/). It will change your `dwm.c`.
+
+### Add autostart in `.xprofile`
+
+For a simple method without updating a `dwm.c`, you can use this method.
+
+Make or edit the file `~/.xprofile` and add autostart script inside:
+```bash
+if [ -f ~/.dwm/autostart.sh ]; then
+    ~/.dwm/autostart.sh &
+fi
+```
+
+## Update DWM from origin
+
+You can update your DWM version from the git repository with this command:
+
+```bash
+git checkout mybranch
+
+git fetch origin master
+git merge origin/master
+
+git push myremote mybranch
+```
+
+## Removing DWM
+
+Just delete the binary file if you want to removing DWM.
+```bash
+sudo rm /usr/local/bin/dwm
+```