Added README.

README.md

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+jekyll2grav converter
+=====================
+
+This is a tool to convert my Jekyll-based [GitHub Pages](https://pages.github.com) blog/wiki
+to [GRAV](https://getgrav.org).
+
+
+Usage
+-----
+
+Copy `config.yaml.example` to `config.yaml` and modify according to your needs. Note that
+`jekyll_dir` has to point to your Jekyll base directory while `grav_dir` has to point to your
+`grav/user/pages` directory.
+
+If not done already, update the Python environment:
+
+    pipenv install
+
+Then run the script:
+
+    pipenv run ./jekyll2grav.py
+
+
+Why GRAV?
+---------
+
+While a static site generator like Jekyll or Hugo has its advantages, I wanted something "more
+inviting" in terms of editor experience (read: a CMS). While there's Netlify + NetlifyCMS to get
+a CMS for a static site generator, you'll still depend on the Netlify service. Also, I wanted
+to get rid of Google CSE (fka. Site Search) and use some integrated search instead.
+
+To keep at least some simplicity, I didn't want the CMS to use MySQL or PostgreSQL but either
+SQLite or flat-files instead.
+
+While I considered e.g. BoltCMS, OctoberCMS or even headless CMSes like ProcessWire,
+GRAV caught my eye.
+
+Since it's using simple Markdown files in a folder structure and the site can be deployed by
+simply copying everything to a PHP-capable server without the need for any special configuration,
+it was the perfect candiate for migrating my Jekyll site. And thus this converter was born.
+