Ajout README pour les contributions éventuelles

README.md

@@ -0,0 +1,41 @@
+# Pas Sage En Seine website
+
+For this new edition, PSES uses [Middleman](https://middlemanapp.com/) static site generator!
+
+## How to use it
+
+### Install bundles
+
+```bash
+bin/bundle install
+```
+
+You may have to update some bundles:
+
+```bash
+bin/bundle update
+```
+
+Bundler don't remove automatically previous bundle installed, if you want to clean your bundle directory, check the bundle versions to remove:
+
+```bash
+bin/bundle clean --dry-run
+```
+
+If you really want to remove those bundles:
+
+```bash
+bin/bundle clean --force
+```
+
+### Compile
+
+```bash
+bin/middleman
+```
+
+## Repositories
+
+  * bin/: contains binaries to install bundles and launch Middleman application
+  * data/: contains data files used for add or remove easily some informations, like partners
+  * source/: contains website source files (HTML, CSS, JavaScript, images…)