write ytmusic stuffs to cache

.gitignore

@@ -4,3 +4,4 @@ private/
 package-lock.json
 .env
 ytmusic_cache
+.vscode

index.js

@@ -88,6 +88,8 @@ async function updateSongs() {
 	if (typeof playlistSongs == 'object') {
 		// For each song that youtube moosic has yelled back at us, give them individually to populateThumbnails()
 		await Promise.all(playlistSongs.map(async song => await populateThumbnails(song)));
+		// Write all of this to cache
+		fs.writeFileSync(path.join(baseDir + 'ytmusic_cache'), JSON.stringify({playlistSongs, thumbnails}));
 	}
 	else {
 		// like legit this shouldnt even be possible