docs: post a merger notice

README.md

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+### libtrx
+
+This is an initiative to create a bridge between the Tomb Raider 1 and Tomb Raider 2 decompilation projects, making it possible to share code between the two.
+
+> [!NOTE]
+> As of October 2024, this repository has been merged into the [TRX
+> project](https://github.com/LostArtefacts/TRX). We invite you to join us at
+> our new home.
+>
+> #### What you need to know
+>
+> - **Rationale**: This decision aims to simplify development, particularly feature and improvement sharing between TR2X and TR1X.
+> - **Repository Access**: This repository is archived. Future development and contributions will occur in the TRX project.
+> - **Contributions**: Please submit issues, pull requests, and discussions to the TRX repository.
+> - **Documentation**: Find all updated documentation and resources in the TRX repository.
+>
+> The LostArtefacts Team