Demo for rosserial working with ROS2

Dependencies:   mbed ros_lib_melodic

Revision:
0:91fdcf1ce3aa
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Oct 29 12:36:50 2021 +0000
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+https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
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