updating readme

Author: ljamt

README.md

@@ -1,7 +1,15 @@
 # local dev
 
+### Jekyll
 Local development of github pages using Jekyll is described here: https://help.github.com/en/github/working-with-github-pages/testing-your-github-pages-site-locally-with-jekyll
 
+To run it locally run the following commands from project root:
+
+- `bundle install`
+- `bundle exec jekyll serve`
+
+
+### Docker (To be updated)
 To avoid installing Ruby and Bundler, the starefossen/github-pages docker image is a good alternative.
 Get docker at https://docs.docker.com/