feat(docs): add new docs and readme (#1529)

Co-authored-by: sergargar <sergio@verica.io>
Co-authored-by: n4ch04 <nachor1992@gmail.com>

docs/tutorials/azure/authentication.md

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+# Azure authentication
+
+By default prowler uses Azure Python SDK identity package authentication methods using the classes `DefaultAzureCredential` and `InteractiveBrowserCredential`.  
+This allows Prowler to authenticate against azure using the following methods:
+
+- Service principal authentication by environment variables (Enterprise Application)  
+- Current az cli credentials stored  
+- Interactive browser authentication  
+- Managed identity authentication  
+
+To launch the tool it is required to specify which method is used through the following flags:
+
+```console
+# To use service principal authentication
+prowler azure --sp-env-auth
+
+# To use az cli authentication
+prowler azure --az-cli-auth
+
+# To use browser authentication
+prowler azure --browser-auth
+
+# To use managed identity auth
+prowler azure --managed-identity-auth
+```
+
+To use Prowler you need to set up also the permissions required to access your resources in your Azure account, to more details refer to [Requirements](getting-started/requirements.md)  

docs/tutorials/azure/subscriptions.md

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+# Azure subscriptions scope
+
+By default Prowler is multisubscription, which means that is going to scan all the subscriptions is able to list. If you only assign permissions to one subscription it is going to scan a single one.  
+Prowler also has the ability to limit the subscriptions to scan to a set passed as input argument, to do so:
+
+```console
+prowler azure --az-cli-auth --subscription-ids <subscription ID 1> <subscription ID 2> ... <subscription ID N>
+```
+
+Where you can pass from 1 up to N subscriptions to be scanned.