[ENH] Tutorial has incomplete resources/instructions

Enhancement description

Related to #559

I am attempting to build the second optional application in the tutorial found here: https://community.rti.com/static/documentation/developers/learn/publish-subscribe.html

This optional exercise instructs the reader to build with CMake but does not provide a CMakeLists.txt.

So, I followed the link in the tutorial to the repository, and copied/pasted the CMakeLists.txt that is provided there. However, building with this file results in the following:

CMake Error at CMakeLists.txt:18 (include):
  include could not find requested file:

    ConnextDdsConfigureCmakeUtils


CMake Error at CMakeLists.txt:19 (connextdds_configure_cmake_utils):
  Unknown CMake command "connextdds_configure_cmake_utils".

Moderators/developers commenting on Issue #559 state that this missing file is an unnecessary utility.

It is my suggestion that, if you want tutorial readers build the example with CMake, you provide them with a working CMakeLists.txt.

Start with the publish-subscribe tutorial and the linked repository example, then inspect the copied CMakeLists.txt and the discussion in issue #559. Verify which CMake configuration is required without ConnextDdsConfigureCmakeUtils; done means the optional application builds successfully using instructions and a working CMakeLists.txt provided by the tutorial.