add commands experiment

packages/core/src/commands/deleteRange.ts

@@ -0,0 +1,14 @@
+import { Command, Range } from '../types'
+
+/**
+ * Delete a given range.
+ */
+export const deleteRange = (range: Range): Command => ({ tr, dispatch }) => {
+  const { from, to } = range
+
+  if (dispatch) {
+    tr.delete(from, to)
+  }
+
+  return true
+}