Add comprehensive skills and documentation for various technologies

.claude/skills/frameworks/django/SKILL.md

@@ -0,0 +1,91 @@
+# Django
+
+## Description
+
+Django web framework with ORM, views, and REST framework patterns.
+
+## When to Use
+
+- Python web applications
+- Admin interfaces
+- Django REST Framework APIs
+
+---
+
+## Core Patterns
+
+### Models
+
+```python
+from django.db import models
+
+class User(models.Model):
+    email = models.EmailField(unique=True)
+    name = models.CharField(max_length=100)
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ['-created_at']
+
+    def __str__(self):
+        return self.email
+```
+
+### Views (Class-based)
+
+```python
+from django.views.generic import ListView, DetailView
+
+class UserListView(ListView):
+    model = User
+    template_name = 'users/list.html'
+    context_object_name = 'users'
+    paginate_by = 20
+
+class UserDetailView(DetailView):
+    model = User
+    template_name = 'users/detail.html'
+```
+
+### Django REST Framework
+
+```python
+from rest_framework import serializers, viewsets
+
+class UserSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = User
+        fields = ['id', 'email', 'name', 'created_at']
+
+class UserViewSet(viewsets.ModelViewSet):
+    queryset = User.objects.all()
+    serializer_class = UserSerializer
+```
+
+### URLs
+
+```python
+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+
+router = DefaultRouter()
+router.register('users', UserViewSet)
+
+urlpatterns = [
+    path('api/', include(router.urls)),
+]
+```
+
+## Best Practices
+
+1. Use class-based views for standard CRUD
+2. Define model methods for business logic
+3. Use serializers for validation
+4. Add proper permissions
+5. Use select_related/prefetch_related for queries
+
+## Common Pitfalls
+
+- **N+1 queries**: Use select_related/prefetch_related
+- **Missing migrations**: Run makemigrations
+- **No validation**: Use serializers properly