Add blurbs for Authors

[JoanneHing]

What feature(s) would you like to see in RepoSense

Add blurbs for repository authors.

If possible, describe the solution

As purposed in #2170, we can use a Markdown file with a specialized format to record the blurbs.

(link to repo branch)
(blurb)
<--delimiter-->
etc

We can also refer to the PR #2191 for relevant updates.