Initial code commit.

backend/src/api/disk-cache.ts

@@ -0,0 +1,16 @@
+import * as fs from 'fs';
+
+class DiskCache {
+  static FILE_NAME = './cache.json';
+  constructor() { }
+
+  saveData(dataBlob: string) {
+    fs.writeFileSync(DiskCache.FILE_NAME, dataBlob, 'utf8');
+  }
+
+  loadData(): string {
+    return fs.readFileSync(DiskCache.FILE_NAME, 'utf8');
+  }
+}
+
+export default new DiskCache();