✨(y-webrtc-signaling) create signaling server

Create signaling server for WebRTC.
It will be used for the collaborative editor, client
will connect to this server to see their
changes in real-time.

src/frontend/apps/y-webrtc-signaling/.eslintrc.cjs

@@ -0,0 +1,14 @@
+module.exports = {
+  root: true,
+  extends: ['impress/next'],
+  parserOptions: {
+    tsconfigRootDir: __dirname,
+    project: ['./tsconfig.json'],
+  },
+  settings: {
+    next: {
+      rootDir: __dirname,
+    },
+  },
+  ignorePatterns: ['node_modules', '.eslintrc.js'],
+};