Create md file dedicated to the 3W Toolkit

toolkit/README.md

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+[![Apache 2.0][apache-shield]][apache] 
+[![Code style][black-shield]][black]
+[![Versioning][semver-shield]][semver]
+
+[apache]: https://opensource.org/licenses/Apache-2.0
+[apache-shield]: https://img.shields.io/badge/License-Apache_2.0-blue.svg
+[black]: https://github.com/psf/black
+[black-shield]: https://img.shields.io/badge/code%20style-black-000000.svg
+[semver]: https://semver.org
+[semver-shield]: https://img.shields.io/badge/semver-2.0.0-blue
+
+# Table of Content
+
+* [Introduction](#introduction)
+* [Release Notes](#release-notes)
+  * [1.0.0](#100)
+  * [1.1.0](#110)
+
+# Introduction
+
+All the 3W Toolkit's sub-modules developed as part of the 3W Project are licensed under the [Apache 2.0 License][apache].
+
+# Release Notes
+
+Each subsection below contains release notes for a specific 3W Toolkit version. Differences from the immediately previous version are highlighted.
+
+## 1.0.0
+
+Release: May 30, 2022.
+
+This was the first published version.
+
+## 1.1.0
+
+Release: July 25, 2024.
+
+Highlights:
+
+1. Makes resources (functions and constants) compatible with 3W Dataset version 2.0.0, which is based on Parquet files.