websocket upload notification - closed #24 (#25)

* Render when a new asset is uploaded from WebSocket notification
* Update Readme

server/src/middlewares/redis-io.adapter.middleware.ts

@@ -0,0 +1,15 @@
+import { IoAdapter } from '@nestjs/platform-socket.io';
+import { RedisClient, createClient } from 'redis';
+import { ServerOptions } from 'socket.io';
+import { createAdapter } from '@socket.io/redis-adapter';
+
+const pubClient = createClient({ url: 'redis://immich_redis:6379' });
+const subClient = pubClient.duplicate();
+
+export class RedisIoAdapter extends IoAdapter {
+  createIOServer(port: number, options?: ServerOptions): any {
+    const server = super.createIOServer(port, options);
+    server.adapter(createAdapter(pubClient, subClient));
+    return server;
+  }
+}