add README

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 # LumberJack bot [![CircleCI](https://circleci.com/gh/clarkzjw/LumberJack.svg?style=svg)](https://circleci.com/gh/clarkzjw/LumberJack)
+
+## Usage
+
+```python
+python3 bot.py
+```
+
+Make sure you have PyAutoGUI installed.
+
+If you use Debian based Linux, you can install PyAutoGUI by
+
+```bash
+sudo apt-get install scrot python3-tk python3 python3-dev python3-pip
+sudo pip3 install image
+sudo pip3 install python3-xlib
+sudo pip3 install pyautogui
+```
+
+## The Docker way
+
+Although the Docker image of this bot cannot work correctly, you can give it a try. Remember to read the comments on top of Dockerfile
+
+```bash
+docker run -it \
+-e DISPLAY=$DISPLAY \
+-v /tmp/.X11-unix:/tmp/.X11-unix \
+clarkzjw/lumberjack
+```
+