Add a colcon.pkg file to override the CMake package name (#242)

* Add a colcon.pkg file to override the CMake package name

Without this file, colcon will take the project name from the
CMakeLists.txt file, which is `CycloneDDS`. This name does not conform
to the standard practices for a ROS package name, and should be
lowercase (i.e. `cyclonedds`).

This `colcon.pkg` will make colcon detect the package dependencies using
this name.

Signed-off-by: Scott K Logan <logans@cottsay.net>

* Drop unneeded package type

This isn't needed as colcon can detect the package type as `cmake`
without it.

Signed-off-by: Scott K Logan <logans@cottsay.net>

colcon.pkg

@@ -0,0 +1,3 @@
+{
+    "name": "cyclonedds"
+}