docs: add readme

Author: zxch3n

README.md

@@ -1 +1,36 @@
-# loro-prosemirror
+# Prosemirror Binding for Loro
+
+- Sync document state with Loro
+- Sync cursors with Loro's Awareness and [Cursor](https://loro.dev/docs/tutorial/cursor)
+- Undo/Redo in collaborative editing
+
+```ts
+import {
+  CursorAwareness,
+  LoroCursorPlugin,
+  LoroSyncPlugin,
+  LoroUndoPlugin,
+  undo,
+  redo,
+} from "loro-prosemirror";
+import { Loro } from "loro-crdt";
+
+const doc = new Loro();
+const awareness = new CursorAwareness(doc.peerIdStr);
+const plugins = [
+  ...pmPlugins,
+  LoroSyncPlugin({ doc }),
+  LoroUndoPlugin({ doc }),
+  keymap({
+    "Mod-z": state => undo(state, () => {}),
+    "Mod-y": state => redo(state, () => {}),
+    "Mod-Shift-z": state => redo(state, () => {}),
+  }),
+  LoroCursorPlugin(awareness, {}),
+];
+const editor = new EditorView(editorDom, {
+  state: EditorState.create({ doc, plugins }),
+});
+```
+
+