Files I've added

This still won't work, still a WIP

scripts/check-webapp.js

@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+
+const fs = require('fs').promises;
+
+async function main() {
+    try {
+        const webappDir = await fs.opendir('webapp');
+        return 0;
+    } catch (e) {
+        console.log("No 'webapp' directory found. Run 'yarn run fetch' or symlink manually");
+        return 1;
+    }
+}
+
+main().then((ret) => process.exit(ret));