Begin mithril frontend

Files are created using the pattern at https://github.com/spacejack/mithril-ts-example,
and in the future we will use https://github.com/MithrilJS/mithril.d.ts#pojo-comp-example-using-this-state.

Change-Id: I60f97250d3e48893fd7e77ce71a74a377e8a2981
diff --git a/ui/src/frontend/track.ts b/ui/src/frontend/track.ts
new file mode 100644
index 0000000..fa9088e
--- /dev/null
+++ b/ui/src/frontend/track.ts
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as m from 'mithril';
+import TrackShell from './track_shell';
+
+const Track = {
+  view() {
+    return m('.track',
+      { style: { border: "1px solid #ccc", padding: "20px" } },
+      m('h1', "Track"),
+      m(TrackShell)
+    );
+  }
+} as m.Component;
+
+export default Track;
\ No newline at end of file