doc: add notes about static pages generation in documentation (closes #6)

README.md

@@ -2,8 +2,47 @@
 
 The repository contains the Frog Collective website implementation.
 
-## Developper guidelines
+## Quickstart
 
+To generate the website, use nox :
+
+```bash
+nox -s build
+```
+
+The website is generated in the build directory.
+
+## Editor Documentation
+
+The content of the website is stored in the "Content" directory.
+
+### Adding news
+
+News can be added by adding a markdown file in the content/news directory. Name
+them with english-formatted date so that they are sorted chronologically in the
+rendered website. The title is defined in the metadatas, in the field 'title',
+the body of the news is the markdown document :
+
+```markdown
+---
+title: Your news title
+---
+
+Mardown content for the news
+```
+
+Date used for the news is the date the file was created in git.
+
+## Developper Documentation
+
+### HTML generation
+
+We use https://git.collectivit.org/collectivit/jean-website to generate the
+website. Jinja2 templates are stored in the src directory, and use the content
+loaded from the 'content' folder to generate static pages. Content can be
+markdown document with metadata, or json files.
+
+### CSS
 We use the BEM naming convention with the scheme
 
 ```css