Extend documentation on URL mapping and views

Expanded the section on URL mapping and views to include a detailed walkthrough of creating an endpoint up to Django server running. Provided specific codes for 'music' app url patterns, setting up 'urls.py' in music folder, and implementing function view 'index'. Also introduced the upcoming section on Django Rest Framework usage.

Author: lipemorais

docs/images/my_first_api.png

@@ -155,9 +155,48 @@ class Song(models.Model):
 
 ## URL Mapping and Views
 
-- 🎬 Lecture : Explanation of URL configurations and Views/ViewSets in Django.
-- 💻 Exercise : Students implement URL mapping and views for a sample API.
-- 💡 Purpose: Practical understanding of Django's routing and controller mechanisms.
+Now let's go to the URL Mapping, we need to associate the url with the handler functions that are called as view in Django. To create a simple endpoint that works.
+
+
+```python
+# first_api.urls.py
+from django.contrib import admin
+from django.urls import path, include
+
+urlpatterns = [
+    path("admin/", admin.site.urls),
+    path("", include('music.urls')),
+]
+```
+
+You need to create a file `urls.py` inside music folder and make it look like the example below.
+
+```python
+# music.urls.py
+from django.urls import path
+
+from . import views
+
+urlpatterns = [
+    path('', views.index, name='index')
+]
+```
+
+And last but not least you need to create this
+you need to create the view. A function view in this case.
+
+```python
+from django.http import HttpResponse
+
+
+def index(_request):
+    return HttpResponse("My first API!")
+```
+
+So no you can use the command `task r` to start our django server, so you can access http://127.0.0.1:8000/ to see it.
+![my_first_api.png](images/my_first_api.png)
+
+Until here we just looked at Django stuff. Now we will  dive into Django Rest Framework(DRF) stuff.
 
 ## Serializers