docs(readme): add deprecation notice

README.md

@@ -1,31 +1,7 @@
-# wasm-miniscript
+# Deprecated
 
-This is a wrapper around the [rust-miniscript](https://github.com/rust-bitcoin/rust-miniscript) crate that is compiled
-to WebAssembly. It allows you to use Miniscript in NodeJS and in the browser.
+This repository has migrated to [`BitGoWASM`](https://github.com/BitGo/BitGoWASM).
 
-# WebUI playground
+The `wasm-miniscript` package has been superseded by the [`wasm-utxo`](https://github.com/BitGo/BitGoWASM/tree/master/packages/wasm-utxo) package.
 
-Go to https://bitgo.github.io/wasm-miniscript to see a live demo of the wasm-miniscript library in action.
-
-# Dependencies
-
-- [Rust](https://www.rust-lang.org/) nightly
-- [wasm-pack](https://rustwasm.github.io/wasm-pack/) (install with `cargo install wasm-pack`)
-- [NodeJS](https://nodejs.org/en/)
-
-# Packages
-
-## packages/wasm-miniscript
-
-This contains the core library that is compiled to WebAssembly.
-It is a wrapper around the `rust-miniscript` crate.
-
-###  Building
-
-If your system has problems with `wasm-pack` (Mac M1), you can use the `Container.mk` Makefile to build the wasm files:
-
-```bash
-cd packages/wasm-miniscript
-make -f Container.mk build-image
-make -f Container.mk build-wasm
-```
+The old README is accessible at [README_OLD.md](./README_OLD.md)

README_OLD.md

@@ -0,0 +1,31 @@
+# wasm-miniscript
+
+This is a wrapper around the [rust-miniscript](https://github.com/rust-bitcoin/rust-miniscript) crate that is compiled
+to WebAssembly. It allows you to use Miniscript in NodeJS and in the browser.
+
+# WebUI playground
+
+Go to https://bitgo.github.io/wasm-miniscript to see a live demo of the wasm-miniscript library in action.
+
+# Dependencies
+
+- [Rust](https://www.rust-lang.org/) nightly
+- [wasm-pack](https://rustwasm.github.io/wasm-pack/) (install with `cargo install wasm-pack`)
+- [NodeJS](https://nodejs.org/en/)
+
+# Packages
+
+## packages/wasm-miniscript
+
+This contains the core library that is compiled to WebAssembly.
+It is a wrapper around the `rust-miniscript` crate.
+
+###  Building
+
+If your system has problems with `wasm-pack` (Mac M1), you can use the `Container.mk` Makefile to build the wasm files:
+
+```bash
+cd packages/wasm-miniscript
+make -f Container.mk build-image
+make -f Container.mk build-wasm
+```