Add first version of the frontend

As of now the only usable functionality is signin in/out and managing
authorized users, and even then there is much room for improvement.

Change-Id: Ib87fc6866f69113a230187710de8644b78391917
diff --git a/frontend/src/consts.js b/frontend/src/consts.js
new file mode 100644
index 0000000..e570b66
--- /dev/null
+++ b/frontend/src/consts.js
@@ -0,0 +1,5 @@
+export const accessLevels = Object.freeze({
+  0: "None",
+  5: "Kill Switch Activator",
+  10: "Admin",
+});