Add a README.md file for the thirdparty/ directory

thirdparty/README.md

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+# Third party libraries
+
+Please keep categories (`##` level) listed alphabetically and matching their
+respective folder names. Use two empty lines to separate categories for
+readability.
+
+
+## fast_noise
+
+- Upstream: https://github.com/Auburn/FastNoiseLite
+- Version: 1.0.1+ (f5c07b98fe490b1fea59879811134ef56b4fcd7d, 2023)
+- License: MIT
+
+Files extracted from upstream source:
+
+- `C/FastNoiseLite.h` as `FastNoiseLite.h`
+
+Some downstream changes are yet to be split into separate git diffs;
+after that's done, it will be possible to reapply them using patches
+included in the `patches` folder.
+
+
+## fast_noise_2
+
+- Upstream: https://github.com/Auburn/FastNoise2
+- Version: 0.10.0-alpha+ (9b75083b87d5e391d43dc0c721d8a9fa51db735a(?), 2023)
+- License: MIT
+
+Files extracted from upstream source:
+
+- TODO
+
+
+## lz4
+
+- Upstream: https://github.com/lz4/lz4
+- Version: 1.9.4 (ae179a9c16aba4dc3b6adefd440c9b77bda1a785, 2022)
+- License: BSD-2-clause
+
+Files extracted from upstream source:
+
+- TODO
+
+
+## meshoptimizer
+
+- Upstream: https://github.com/zeux/meshoptimizer
+- Version: git (316167c3606c4bfd7647976ca0299afa31163ea7, 2021)
+- License: MIT
+
+Files extracted from upstream source:
+
+- TODO
+
+
+## sqlite
+
+- Upstream: https://sqlite.org/download.html (source code amalgamation)
+- Version: 3.45.2 (2024)
+- License: MIT
+
+Files extracted from upstream source:
+
+- `sqlite3.c`
+- `sqlite3.h`
+- `sqlite3ext.h`
+