Add development instructions to README.md

Signed-off-by: Riccardo Iaconelli <riccardo.iaconelli@qredo.com>
diff --git a/README.md b/README.md
index 1760ecb..166a615 100644
--- a/README.md
+++ b/README.md
@@ -30,3 +30,14 @@
 
 The Milagro website itself is completely static, being automatically generated by [Docusauraus](https://docusaurus.io/) prior to deployment. The content of the website is written in a mixture of HTML and Markdown.
 
+Developing
+==========
+
+In this repository there's a docker-compose file which will start a local version of the website for development purpose. Just run
+
+```
+docker-compose up
+```
+
+and point your browser to http://localhost:3000
+