Implement hook_help()

Hi Team

I created MR for this issue, please Review.

Thanks

The issue summary still needs to describe what the proposed change is, and why it is proposed.

Added Issue Summary and raised new MR.
Kindly Review: Merge request !9

Thank you for filing this issue and for working on it.

@adminazhar Please don't open a new MR when you just want to add a one line change. You can get push access to any existing MR and just push your commits on top of that. There might be a few cases where a new MR might actually make sense, like if there are multiple different ways to fix an issue and it there isn't a consensus in the issue about the best fix. But this is definitely not one of those cases. With multiple MRs it is really difficult to review the changes you made compared to just updating an existing MR and it adds unnecessary noise to the issue. Can you plase close your MR and push any changes on top of the existing MR?

Some more issues I have with both MRs in the current state:

1. I don't think the current help text adds a lot of value to users. We could just copy more text from the README or the release notes, but that would mean a lot of unnecessary duplication and more work to keep everything in sync and has a potential to miss updating one of the sources, when needed. We could also just add a reference to the project page or README, but users should already be aware of it, so I don't think we should do that. I'm just not convinced that we really need to implement this hook.
2. I don't like the switch statement, because it is loosely typed. Not such an issue here, but I would rather replace this with an if and return early to save unnecessary indentation.

I will implement hook_help() which will refer to the README.md file.

Updated the implementation of hook_help().
attached is the screenshot of the help page which will fetch the content from the README.md file.
kindly review.

Reviewed the MR. Help text is available in the module. Attaching screenshot for reference.