Initial plasmo setup

src/popup.tsx

@@ -0,0 +1,11 @@
+function IndexPopup() {
+  return (
+    <div style={{ width: 180 }}>
+      <p>
+        Extension running at version {chrome.runtime.getManifest().version}
+      </p>
+    </div>
+  )
+}
+
+export default IndexPopup