Update README

README.md

@@ -5,15 +5,23 @@ have to install anything, since everything is generated by the continuous integr
 
 # For contributing #
 
+If you want to edit the website before the release, for updating informations,
+for releasing your plugin, I strongly encourage you to do so. As usual you can use a
+branch `feature/...` and a merge-request to `master`.
+
+## Git LFS ##
+
 Get Git LFS from the `git-lfs` package or directly from:
 ```
 curl -s https://packagecloud.io/install/repositories/github/git-lfs/script.deb.sh | sudo bash
 sudo aptitude install git-lfs
 ```
 
-Get the repository normaly:
+Get the repository normally and initialize Git LFS:
 ```
 git clone git@git.frama-c.com:frama-c/frama-c.frama-c.com
+cd frama-c.frama-c.com
+git lfs install
 ```
 
 The bigfiles of the website (*.pdf, *.tar.gz) are not directly in the git
@@ -31,10 +39,52 @@ Or all pdf:
 git lfs pull -X "" -I "*.pdf"
 ```
 
-
-If you want to edit the website before the release, for updating informations,
-for releasing your plugin, I strongly encourage you to do so. As usual you can use a
-branch `feature/...` and a merge-request to `master`.
-
 If you want to add a bigfile you have nothing to do. `git push` will
 send the needed files.
+
+## Generate the changelog page ##
+
+The changelog page isn't present in the repository but is generated each time
+from the original changelogs. To generate it locally, you can execute the
+following commands:
+```
+cd generator
+chmod +x ./generate
+curl https://git.frama-c.com/api/v4/projects/780/repository/files/Changelog/raw?ref=master > ../assets/Changelog
+curl https://git.frama-c.com/api/v4/projects/780/repository/files/src%2Fplugins%2Fe-acsl%2Fdoc%2FChangelog/raw?ref=master >> ../assets/Changelog
+curl https://git.frama-c.com/api/v4/projects/780/repository/files/src%2Fplugins%2Fwp%2FChangelog/raw?ref=master >> ../assets/Changelog
+./generate ../assets/Changelog -o ../html/changelog.html
+```
+
+## Installing a development environment ##
+
+The website is using Ruby dependencies to generate a static site. The
+dependencies can be installed through bundler.
+
+First check that Ruby and Ruby-gems are installed, if that's not the case check
+your distribution documentation to install these two packages:
+```
+ruby -v
+gem -v
+```
+
+Install Bundler:
+```
+gem install bundler -v '2.0.2'
+```
+
+Use Bundler to install the required dependencies, launch this command from the project root directory:
+```
+bundle install -j $(nproc) --path vendor
+```
+
+You can then either build the static site:
+```
+bundle exec jekyll build -d test --future
+```
+
+Or serve it locally to see your modifications in realtime by accessing
+<http://127.0.0.1:4000>:
+```
+bundle exec jekyll serve
+```
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