Some useful additions to README.md

[trch-dr]

Description:
Documentation on how to get the latest LTS .Net version dotnet-version: x etc.
A link to https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-install-script#options for a list of quality value descriptions.

Justification:
It would be much easier than going through the source code in my opinion :-D

Are you willing to submit a PR?
Sure, I have a branch ready, but I need permissions to push it.

[suyashgaonkar]

Hi @trch-dr , Thank you for creating this feature request. We will investigate it and provide feedback as soon as we have some updates.