add link to contributing.md and update section documentation

README-dev.md

@@ -4,11 +4,11 @@ README for developers
 This page is dedicated to rules and conventions that Chameleon's
 developers must follow and that should be read by contributors.
 
-Gitlab flow
+Gitlab flow: how to contribute to Chameleon
 ---------------------
 
-TODO - Write here how to use git and gitlab to push modifications into
-Chameleon.
+Please read and follow guidelines given here:
+https://gitlab.inria.fr/solverstack/chameleon/blob/master/CONTRIBUTING.md
 
 ### Update submodules
 
@@ -29,7 +29,38 @@ git push --recurse-submodules=check
 Documentation
 ---------------------
 
-TODO - Write here how to generate the documentation.
+### Generate the documentation
+
+#### Prerequisites
+
+To generate the documentation you need to have
+[Doxygen](http://www.stack.nl/~dimitri/doxygen/) and
+[Texinfo](https://www.gnu.org/software/texinfo/) installed on your
+system.
+
+For example, on Debian systems:
+```
+#!shell
+sudo apt install doxygen texinfo
+```
+
+#### configure + make documentation
+
+Enter into the Chameleon's source root directory and configure with
+*CHAMELEON_ENABLE_DOCS=ON*, then generate the documentation with `make
+docs`
+
+```
+#!shell
+cd chameleon
+mkdir build && cd build
+cmake .. -DCHAMELEON_ENABLE_DOCS=ON
+make docs
+```
+
+### Rules about source code documentation
+
+TODO - Write here the rules to document source code inside chameleon.
 
 Packaging
 ---------------------