Update the Readme file

Updated the links and changed file from .rst to .md.

README.md

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+Layered file protocols
+======================
+<p align="center">
+  <a href="https://layered-file-protocols.readthedocs.io/en/latest/?badge=latest">
+    <img src="https://readthedocs.org/projects/layered-file-protocols/badge/?version=latest" alt="Documentation status"/>
+  </a>
+  <a href="https://github.com/equinor/layered-file-protocols/actions/workflows/build.yml">
+    <img src="https://github.com/equinor/layered-file-protocols/actions/workflows/build.yml/badge.svg" alt="Core build status"/>
+  </a>
+</p>
+
+The landing page for Layered file protocols is hosted at
+[readthedocs](https://layered-file-protocols.readthedocs.io/en/latest/).