Add README.md (#818)

Signed-off-by: David V. Lu <[email protected]>

Author: DLu

README.md

@@ -0,0 +1,8 @@
+# ROS 2 Launch Framework
+## Tools for launching multiple processes and for writing tests involving multiple processes.
+
+ * [License](LICENSE)
+ * [Contribution Guide](CONTRIBUTING.md)
+ * [Conceptual Documentation](https://docs.ros.org/en/rolling/Concepts/Basic/About-Launch.html)
+ * [Tutorials](https://docs.ros.org/en/rolling/Tutorials/Intermediate/Launch/Launch-Main.html)
+ * [Package Documentation](https://docs.ros.org/en/rolling/p/launch/)