add docs folder for github page

docs/README.md

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+## Bash script to optimize your images and convert them in WebP 
+
+### Prerequisite
+
+* jpegoptim
+* optipng
+* WebP
+
+Debian/Ubuntu :
+
+```bash
+sudo apt install jpegoptim optipng webp -y
+```
+
+Centos 7  :
+
+```bash
+sudo yum install optipng jpegoptim libwebp-tools -y
+```
+
+### What does the script do
+
+1) optimize jpg images with jpegoptim
+2) optimize png images with optipng
+3) convert jpg & png images in WebP (without deleting them)
+
+WebP image name example for mybackground.png : mybackground.png.webp
+
+---
+
+### Usage
+
+1) Download the script and make it executable
+
+```bash
+wget https://raw.githubusercontent.com/VirtuBox/wp-optimize/master/optimize.sh
+chmod +x optimize.sh
+```
+
+2) Launch the script and set the path of your images as first argument
+
+```bash
+./optimize.sh /path/to/your/images
+```
+
+To avoid permissions issues, you can run the script with another user with sudo
+
+```bash
+sudo -u www-data ./optimize.sh /path/to/your/images
+```
+
+### Warning
+
+Conversion process can take a while, you can use `tmux` to launch the script and be able to close your ssh connection without interrupting conversion. Then just use `tmux attach` to login back in your tmux session.