add a readme

Author: Ekleog

README.md

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+# SortableJS-rs
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+This crate provides rusty bindings to SortableJS.
+
+The documentation mostly lives with [the official SortableJS documentation](https://github.com/SortableJS/Sortable).
+
+Just adding this crate as a dependency should be enough to get everything working when using [trunk](https://trunkrs.dev/). Just be careful to keep alive the return value of `Sortable::apply`, or you will get JavaScript exceptions.
+
+You can find example usage of SortableJS from a pure-Rust WASM application in the `examples/` directory.