Add Azure integration testing README file

[CarlosRS9]

We should create a new README.md for the Azure integration tests explaining anything relevant to know so the rest of the team may be able to use them.

Here are some of the contents we should add to this readme file:

• How the Azure environment is set up and which resources are being used by the tests.
• How to manually run the tests
• Dependencies required by the tests
• The structure of the folder and its relevant contents, including files in the wazuh-testing package

Finally, we should also update the current README.md file present in https://github.com/wazuh/wazuh-qa/tree/master/tests/integration/ to reflect the new tests.

Tasks

• Create the new README file and its contents
• Update the generic README file

[fdalmaup]

Due to the changes planned for version 5.0, the analysis that is being carried out regarding the External integrations modules, the team's efforts for improvements will be directed to the mentioned version.