Add simple readme and rename APIs

javascript/README.md

@@ -0,0 +1,25 @@
+# yoga-layout
+
+This package provides JavaScript bindings for the Yoga layout engine as either WebAssembly (for browsers, Node) or asm.js (other clients or clients unable to read package export maps).
+
+## Usage
+
+The default entrypoint provides an asynchronous loader function to return a Yoga instance.
+
+```ts
+import { loadYoga, ALIGN_CENTER } from "yoga-layout";
+
+const Yoga = await loadYoga();
+
+const node = Yoga.Node.create();
+node.setAlignContent(ALIGN_CENTER);
+```
+
+An alternative synchronous API is provided for compatibility, but requires using asm.js in browsers instead of WebAssembly, leading to worse performance and larger assets.
+
+```ts
+import Yoga, { ALIGN_CENTER } from "yoga-layout/sync";
+
+const node = Yoga.Node.create();
+node.setAlignContent(ALIGN_CENTER);
+```