projects: ad-acevsecrdset-sl: Added readme doc

[jvelasc2]

Added the readme document for the AD-ACEVSECRDSET-SL project.

Also modified the projects_doc.rst file to add the corresponding source for this new readme.

PR Type

• Bug fix (change that fixes an issue)
• New feature (change that adds new functionality)
• Breaking change (has dependencies in other repos or will cause CI to fail)

PR Checklist

• I have followed the Coding style guidelines
• I have complied with the Submission Checklist
• I have performed a self-review of the changes
• I have commented my code, at least hard-to-understand parts
• I have build all projects affected by the changes in this PR
• I have tested in hardware affected projects, at the relevant boards
• I have signed off all commits from this PR
• I have updated the documentation (wiki pages, ReadMe etc), if applies

[buha]

can you check this error out ? it happens on several documentation PRs:

looking for now-outdated files... /home/vsts/work/1/s/doc/sphinx/source/projects/ad-acevsecrdset-sl.rst:: ERROR: Anonymous hyperlink mismatch: 2 references but 0 targets.

[jvelasc2]

Hi @buha ,
I've already fixed the documentation build error. Also, did a rebase to get the latest commits.
Thank you.

[jvelasc2]

Hi @buha ,
I just wanted to ask if we need to do a rebase for the existing readme doc PRs, so that our branches remain updated. Or we can leave them as is and just rebase when you finish your reviews?

Thank you.

-- Joyce