jsgen: add README.md (vlang#21630)

kimshrier · Jun 1, 2024 · 7cff1f7 · 7cff1f7
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+# JavaScript backend
+
+## Attributes
+
+When specified on an interface, the `@[single_impl]` attribute prevents any type from
+implementing it.
+
+## Verbatim lines
+
+Any lines starting with a `#` character will be included verbatim in the final output.
+
+## See also
+
+A lot of important code is under the `vlib/builtin/js` directory. Especially
+`jsfns*.js.v` which defines all supported built-in JavaScript types and functions.