Add embeddedRTPS as experimental middleware (backport #29)

[mergify]

This is an automatic backport of pull request #29 done by Mergify.
Cherry-pick of c4d02ba has failed:

On branch mergify/bp/main/pr-29
Your branch is up to date with 'origin/main'.

You are currently cherry-picking commit c4d02ba.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .gitignore
	new file:   .images/cube.png
	new file:   .images/microros_logo.png
	new file:   embeddedrtps.md
	new file:   microros_static_library_ide/library_generation/colcon-embeddedrtps.meta
	modified:   microros_static_library_ide/library_generation/colcon.meta
	modified:   microros_static_library_ide/library_generation/extract_flags.py
	modified:   microros_static_library_ide/library_generation/library_generation.sh
	new file:   sample_main_embeddedrtps.c

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   README.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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