chore: Add Firebase emulator and project gitignore configuration

Author: exaby73

packages/firebaseui-core/.gitignore

@@ -0,0 +1,24 @@
+# Firebase
+firebase-debug.log
+ui-debug.log
+.firebaserc
+
+# Build output
+dist/
+*.tgz
+
+# Dependencies
+node_modules/
+
+# Environment variables
+.env*
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db 

packages/firebaseui-core/firebase.json

@@ -0,0 +1,12 @@
+{
+  "emulators": {
+    "auth": {
+      "port": 9099
+    },
+    "ui": {
+      "enabled": true,
+      "port": 4000
+    },
+    "singleProjectMode": true
+  }
+}