chore: 添加第三方依赖库

thirdparty/rapier.js/builds/prepare_builds/README.md

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+# Prepare builds
+
+This project helps with making specific package: it takes a few parameter to create a (1) folder ready to compile.
+
+It uses clap so you can pass `-h` to get more info about its parameters.
+
+## usage
+
+At workspace root: `cargo run -p prepare_builds -- -d dim2 -f simd`.
+
+Or use provided scripts: `./builds/prepare_builds/prepare_all_projects.sh && ./builds/prepare_builds/build_all_projects.sh`
+
+## Technical considerations
+
+Askama/rinja was not chosen because compiled templates make it difficult to iterate on a folder and parse all templates.
+
+This folder is in `builds/` only for the workspace member glob to not complain if `builds/` is inexistent or empty.