chore: add readme

README.md

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+# Dockerized Jekyll
+
+## Presentation
+
+A dynamicaly configurable [Jekyll](https://jekyllrb.com) container.  
+I Needed a static site generator which I could put in container I found Jekyll.  
+Alas, existing containers available on the net where either too old or too complex for my understanding.  
+Counting on my modest shell scripting skills, I managed to give life to an abomination working mainly by the mighty will of GNU sed.
+
+## How to use it ?
+
+- Edit `./data/.env` to fit your needs.
+- Create `./data/<blog_name>_description.txt`, with the wanted website description.  
+  **Be carefull to remove whitespaces at line start**. It will not properly indented when put in the `_config.yml`, fudging up the description format.
+- Build the image via the provided `docker-compose.yml` file.
+- Run the service.
+
+Variables in .env and the site description are updated at container restart.  
+**Keep in mind that changing your site name (with `BLOG_NAME` var) will fudge up all reference files (site description, site path etc.).**
+
+## Disclaimer
+
+This software is provided as-is and is the offspring of a humble sysadmin mind, constantly learning new things.  
+It will be improved the time beeing.