Update README for report_py3o and report_py3o_fusion_server

[alexis-via]

Convert README to the new readme subdirectory

[sbidoul]

/ocabot merge

[OCA-git-bot]

@sbidoul The merge process could not start, because command git rebase --autosquash 12.0 failed with output:

First, rewinding head to replay your work on top of it...
Applying: Update README for report_py3o and report_py3o_fusion_server
Using index info to reconstruct a base tree...
Falling back to patching base and 3-way merge...
Auto-merging report_py3o/readme/ROADMAP.rst
CONFLICT (add/add): Merge conflict in report_py3o/readme/ROADMAP.rst
error: Failed to merge in the changes.
Patch failed at 0001 Update README for report_py3o and report_py3o_fusion_server
Use 'git am --show-current-patch' to see the failed patch

Resolve all conflicts manually, mark them as resolved with
"git add/rm <conflicted_files>", then run "git rebase --continue".
You can instead skip this commit: run "git rebase --skip".
To abort and get back to the state before "git rebase", run "git rebase --abort".

[sbidoul]

@alexis-via the README is broken. Can you try generating it manually to fix the error?

Normally such errors are caught when merging with /ocabot.