Initial commit: React + Django full-stack project setup

- Backend: Django 4.2 + DRF + JWT + GraphQL
- Frontend: React 18 + MobX + styled-components
- Deployment: Docker + Docker Compose + Nginx
- Database: PostgreSQL support
- Documentation: README, INIT, PROJECT_DOCS, TESTING

backend/apps/users/serializers.py

@@ -0,0 +1,20 @@
+from rest_framework import serializers
+from .models import User
+
+
+class UserSerializer(serializers.ModelSerializer):
+    """Serializer for User model."""
+
+    class Meta:
+        model = User
+        fields = ('id', 'username', 'email', 'first_name', 'last_name', 'avatar')
+        read_only_fields = ('id',)
+
+
+class UserDetailSerializer(serializers.ModelSerializer):
+    """Detailed serializer for User model."""
+
+    class Meta:
+        model = User
+        fields = '__all__'
+        read_only_fields = ('id', 'date_joined', 'last_login')