Add renesas RA6M5 (backport #390)

[mergify]

This is an automatic backport of pull request #390 done by Mergify.
Cherry-pick of d27b83e has failed:

On branch mergify/bp/foxy/pr-390
Your branch is up to date with 'origin/foxy'.

You are currently cherry-picking commit d27b83e.
  (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:
	new file:   config/renesas_ra/dev_ros2_packages.txt
	new file:   config/renesas_ra/dev_uros_packages.repos
	new file:   config/renesas_ra/list_apps.sh
	new file:   config/renesas_ra/ra6m5/board.repos
	new file:   config/renesas_ra/ra6m5/build.sh
	new file:   config/renesas_ra/ra6m5/client_uros_packages.repos
	new file:   config/renesas_ra/ra6m5/configure.sh
	new file:   config/renesas_ra/ra6m5/create.sh
	new file:   config/renesas_ra/ra6m5/flash.sh
	modified:   scripts/create_firmware_ws.sh

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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