Add README

Author: alexjg

README.md

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+# Automerge + Codemirror
+
+This plugin adds collaborative editing to codemirror using `automerge-repo`.
+
+## Example
+
+```typescript
+import { Repo } from "@automerge/automerge-repo";
+import { automergeSyncPlugin } from "@automerge/automerge-codemirror";
+import { EditorView } from "@codemirror/view"
+import { basicSetup } from "codemirror"
+
+// Setup a repo and create a doc handle. In practice you'll probably get a
+// DocHandle by loading it from a document URL
+const repo = new Repo(..)
+const doc = repo.create({text: ""})
+
+// Setup the codemirror view
+const container = document.createElement("div")
+const view = new EditorView({
+  doc: handle.docSync()!.text,
+  extensions: [
+    basicSetup,
+    automergeSyncPlugin({
+      handle,
+      path: ["text"],
+    }),
+  ],
+  parent: container,
+})
+```
+