feat(skeleton): add testing documentation structure

[Diogo21Costa]

PR Description

The document is organized into six main sections:

1. Introduction: Briefly describes the core components of the test framework.

2. Test Framework Overview: Explores the interaction of core components and deployment of tests.

3. Practical Guide: Provides practical guidelines for setting up the test framework, including four subtopics:

   • Directory Structure: Explains how to set up the test framework and integrate it with the module under test.
   • Test Configuration File: Describes how developers can configure a battery of tests.
   • Tests Definition: Offers a detailed description of how to write tests.
   • How to Use: Provides a detailed guide on setting up the entry point for tests in the module under test and utilizing the Python API.

4. For Advanced Users: Targets users seeking an in-depth understanding of the framework's workflow and how to create new recipes for various test scenarios.

5. Extending Framework Tests: Offers guidelines on expanding the framework of tests, covering:

   • Contributing to Tests Repository: Explores how to extend the tests repository of the test framework.

6. Demos: Provides practical examples of how the test framework can be configured to deploy tests using QEMU.

Checklist:

• The changes follows the documentation guidelines described in here.
• The changes generate no new warnings when building the project. If so, I have justified above.
• I have run the CI checkers before submitting the PR to avoid unnecessary runs of the workflow.

Do you have any suggestions regarding the structure of the documentation?