feat: add dependency

javascript-engine/external/boa/boa_unicode/README.md

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+# boa-unicode
+
+`boa-unicode` defines the trait to provide methods for querying properties or classes for Unicode identifiers. These properties are used to determine if a code point (char) is valid for being the start/part of an identifier in lexer and parser.
+
+Current version: Unicode 15.0.0
+
+## Development
+
+The Unicode character tables used to query properties are generated by `build_tables.js`. This script depends on [Node.js](https://nodejs.org/en/) and [rustfmt](https://github.com/rust-lang/rustfmt). You can run the script with:
+
+```
+$ node build_tables.js
+```
+
+or with [npm](https://www.npmjs.com/):
+
+```
+$ npm run build-tables
+```
+
+The configurations are defined as constants in the script. Please check the comments in `build_tables.js` for more information.
+
+## More Info
+
+- [Unicode® Standard Annex #31 - UNICODE IDENTIFIER AND PATTERN SYNTAX](https://unicode.org/reports/tr31/)
+- [Unicode® Standard Annex #44 - UNICODE CHARACTER DATABASE](https://unicode.org/reports/tr44/)