chore: added license and patch info

packages/frontend/src/scripts/libopenmpt/readme.md

@@ -0,0 +1,23 @@
+modifications made to `libopenmpt.js` (can be taken from https://lib.openmpt.org/libopenmpt/download/):
+
+at the beginning of the file:
+```js
+// @ts-nocheck
+/* eslint-disable */
+```
+
+at the end of the file:
+```js
+Module.UTF8ToString = UTF8ToString;
+Module.writeAsciiToMemory = writeAsciiToMemory;
+export { Module }
+```
+
+replace
+```
+wasmBinaryFile="libopenmpt.wasm"
+```
+with
+```
+wasmBinaryFile=new URL("./libopenmpt.wasm", import.meta.url).href
+```