[WFX-333] Update and rename README.txt to README.md

README.md

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+<h1 align="center">Waterfox Source Code</h1>
+
+[![Website](https://img.shields.io/website?url=https://www.waterfox.net)](https://www.waterfox.net)
+[![🏗 Builds](https://github.com/WaterfoxCo/Waterfox/actions/workflows/push.yml/badge.svg)](https://github.com/WaterfoxCo/Waterfox/actions/workflows/push.yml)
+[![License: MPL 2.0](https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg)](https://opensource.org/licenses/MPL-2.0)
+
+An explanation of the Waterfox Source Code Directory Structure and links to
+project pages can be found at the [Directory Structure documents](https://firefox-source-docs.mozilla.org/contributing/directory_structure.html).
+
+For information on how to build Waterfox from the source code and create patches see the [quick reference](https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html).
+
+### Developer Working Hours
+
+Typically, we are available 9:00 🕘 → 17:00 🕔, Monday → Friday. This does not include [UK bank holidays](https://www.gov.uk/bank-holidays) or annual leave. During this time we will be programming or responding to queries as and when appropriate.