Add documentation for adding Maven dependencies

[Shekharrajak]

Ref #393

• doc-needed
• doc-not-needed

[github-actions]

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[wenjin272]

Hi, @Shekharrajak, thanks for your contribution.

I think this document is very detailed and specific, thank you for your hard work.

However, we might not want to dedicate such a long section to covering all dependency details. Instead, we could briefly introduce, in the section like "Installation," which artifacts users should depend on when developing Agent applications based on flink-agents (api + integration). Also, what additional dependencies are needed if one wants to run it in an IDE. (runtime + flink artifacts)

WDYT?

[Shekharrajak]

Thanks @wenjin272 for the review. Check the new commit : 891f52f