docs(README): add list adapters section

[czar0]

Closes #3218

Description

A section in the README to explain how to generate a list of all available adapters.

Changes

A bunch of lines in the README (only docs) and one line in .gitignore.

Steps to Test

N/A

Quality Assurance

N/A

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Latest commit: 9ca1671

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[karen-stepanyan]

Hey @czar0 . Thanks for opening the PR. What's the intention of this change ? The MASTERLIST.md is created/updated automatically after every release, so it contains up-to-date information and is available at a root level. Why would anyone want to generate it manually ?

[czar0]

oh, shoot! I wondered whether that script was even called anywhere😄 (apologies). Anyway, this unclarity builds even a stronger case for this simple addition. The intent is to slightly improve the user experience by presenting to the end user a list of available adapters (the culprit MASTERLIST.md).
Put it in a story format: As an end user, I want to have a concise list of available external adapters and their properties so that I can quickly understand their purpose and start using them.
I believe a small addition to the README should be enough (changes just pushed).
Let me know if that makes sense to you.

[karen-stepanyan]

I agree that we can include information about Masterlist in the main readme. Suggested a minor change