Initial commit: TimeReg Flutter app med Firebase backend

- Opprettet Flutter-prosjekt med alle nødvendige avhengigheter
- Implementert datamodeller (User, TimeRegistration, TariffProfile, Deviation, AuditLog)
- Implementert tjenester (AuthService, TimeService)
- Implementert Riverpod providers for state management
- Opprettet autentiseringsskjermer (login, signup, reset password)
- Opprettet hjemmeskjerm med timer-funksjonalitet
- Opprettet placeholder-skjermer for historikk, rapporter og profil
- Lagt til norsk dokumentasjon i README

.gitignore

@@ -0,0 +1,45 @@
+# 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-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# 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