Replace README.txt with README.md

Created MR for the issue.
Please review.
Thanks

Hi @Sonal Gyanani ,Reviewed your merge request. the README.md file was good after the merge request. But i have suggestion- title second word need to be start with capital(Component block).

I have confirmed changes. README file extension is changing. But did not find any conflict in MR.

The pipline is throwing error of PHPCS and PHPCS issues is solving in another ticket https://www.drupal.org/project/component_blocks/issues/3338106 📌 Fix the errors/warnings reported by PHP_CodeSniffer Needs work .
So waiting to fix PHPCS issyes.

Hi ravi kant

I reviewed your changes in MR!6 and noticed that maintainers section is not following the README.md format for mainainter, it should be - Daniel F. Kudwien - [sun](https://www.drupal.org/u/sun).
"Table of Contents" should be small letter Table of contents

Thank you.

Hi thakurnishant_06

I reviewed your changes and in the "Installation" section this text should be removed You will need to do a cache rebuild after adding/updating layouts since this is also stated in "Configuration" section that it needs to do run drush cr.

Thank you.

Hi @larowlan,
Updated the file as per the suggestion.