Added section on development and contribution in README.md.

README.md

@@ -117,6 +117,10 @@ data structures for storing object in an organized and thread-safe way.
 Build and Installation
 ======================
 
+Note: It is recommended to build from a packaged release file and not from a
+snapshot of the repository in order to get the documentation and the examples
+out-of-the box.
+
 EMB² is built using CMake (version 2.8.9 or higher). CMake is a build file
 generator which allows to abstract from the concrete build tools. To generate
 and invoke the platform-specific build files, open a shell (on Windows, use
@@ -296,6 +300,14 @@ Known Bugs and Limitations
   embb::base::Thread).
 
 
+Development and Contribution
+============================
+
+The EMB² team welcomes all kinds of contributions, preferably as pull requests
+or patches via the development mailing lists (see above). If possible, please
+refer to a current snapshot of the development branch.
+
+
 Links
 =====