Several tutorials lack README files

[dandv]

There should be a README.md at:

• https://github.com/GoogleChrome/chrome-extensions-samples/tree/main/functional-samples/tutorial.tabs-manager
• https://github.com/GoogleChrome/chrome-extensions-samples/tree/main/functional-samples/tutorial.getting-started

[TrickSumo]

Created PR:- #1371

[jamalimubashirali]

Hello, @oliverdunk if this issue is available, I would like to contribute.

[oliverdunk]

@jamalimubashirali Given the open PR we don't need any contributions here at the moment. There may be other samples missing a README, but please check:

1. That there aren't any other PRs open for the READMEs you want to add.
2. Nobody has recently offered to work on them in Need to write READMEs for all samples #798

We appreciate the help but want to avoid multiple people doing the same work :)