Add tutorial and requirements to index.md

A new tutorial was added to the main documentation page, it covers the goal and the requirements for setting up the Music API. DRF and Django are introduced as the main tools in this tutorial, replacing the sequence diagram.

Author: lipemorais

docs/index.md

@@ -2,18 +2,20 @@
 
 ## Summary
 
+The goal of this tutorial is for you to have Music API ready to receive songs, albums, and artists. While you learn [Django](https://www.djangoproject.com/) and [Django Rest Framework a.k.a DRF](https://www.django-rest-framework.org/) to build you first API
+
+Requirements list:
+1. Python 3
+2. Git
+3. 
+
 - **Total Duration:** 3 hours 30 minutes
 - **Lecture:** 1 hour (approximately 30%)
 - **Exercises:** 2 hours 30 minutes (approximately 70%)
 
 
 [Presentation slides](https://docs.google.com/presentation/d/1Ajv9MYQQ011_Y4r1W4I6Y-6XP_faFF0317Zkn2XupMw/edit?usp=sharing) 📊
 
-```mermaid
-sequenceDiagram
-    Alice ->> Bob: Hello Bob, how are you?
-```
-
 
 ## Introduction and Overview