docs(firebase_login): add firebase login example app

examples/firebase_login/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+# Firebase configurations
+firebase.json
+firebase_options.dart

examples/firebase_login/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+      base_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+    - platform: android
+      create_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+      base_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+    - platform: ios
+      create_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+      base_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+    - platform: macos
+      create_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+      base_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+    - platform: web
+      create_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+      base_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+    - platform: windows
+      create_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+      base_revision: 68415ad1d920f6fe5ec284f5c2febf7c4dd5b0b3
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

examples/firebase_login/README.md

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+# Firebase Login
+
+Example flutter app built with Riverpod that demonstrates authentication with Firebase.
+
+<table>
+  <tr>
+    <td><img src="./samples/demo.gif" alt="demo" width="320"></td>
+    <td><img src="./samples/error.png" alt="error" width="320"></td>
+    <td><img src="./samples/signup.png" alt="signup" width="320"></td>
+    <td><img src="./samples/home.png" alt="home" width="320"></td>
+  </tr>
+</table>
+
+## Features
+
+- Sign up with Email and Password
+- Sign in with Email and Password
+- Sign in with Google
+- Error handling
+
+## Getting Started
+
+1. Generate the native folders first by running `flutter create --platforms=android,ios,web,windows,macos .`
+2. Create your firebase project, and enable email/password authentication and google.
+3. Use [FlutterFire CLI](https://firebase.google.com/docs/flutter/setup?platform=ios) to connect the app with the firebase project.
+4. Follow the [platform integration steps](https://pub.dev/packages/google_sign_in#platform-integration) for the `google_sign_in` package.
+5. Run the app.
+6. To run the tests, run `flutter test`.

examples/firebase_login/analysis_options.yaml

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+include: ../analysis_options.yaml
+# enable riverpod_lint
+analyzer:
+  errors:
+    prefer_relative_imports: ignore
+  plugins:
+    - custom_lint