docs(iac): add documentation for IaC (#8150)

Co-authored-by: Rubén De la Torre Vico <rubendltv22@gmail.com>

docs/tutorials/iac/getting-started-iac.md

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+# Getting Started with the IaC Provider
+
+Prowler's Infrastructure as Code (IaC) provider enables you to scan local infrastructure code for security and compliance issues using [Checkov](https://www.checkov.io/). This provider supports a wide range of IaC frameworks, allowing you to assess your code before deployment.
+
+## Supported Frameworks
+
+The IaC provider leverages Checkov to support multiple frameworks, including:
+
+- Terraform
+- CloudFormation
+- Kubernetes
+- ARM (Azure Resource Manager)
+- Serverless
+- Dockerfile
+- YAML/JSON (generic IaC)
+- Bicep
+- Helm
+- GitHub Actions, GitLab CI, Bitbucket Pipelines, Azure Pipelines, CircleCI, Argo Workflows
+- Ansible
+- Kustomize
+- OpenAPI
+- SAST, SCA (Software Composition Analysis)
+
+## How It Works
+
+- The IaC provider scans your local directory (or a specified path) for supported IaC files.
+- No cloud credentials or authentication are required.
+- Mutelist logic is handled by Checkov, not Prowler.
+- Results are output in the same formats as other Prowler providers (CSV, JSON, HTML, etc.).
+
+## Usage
+
+To run Prowler with the IaC provider, use the `iac` argument. You can specify the directory to scan, frameworks to include, and paths to exclude.
+
+### Basic Example
+
+```sh
+prowler iac --scan-path ./my-iac-directory
+```
+
+### Specify Frameworks
+
+Scan only Terraform and Kubernetes files:
+
+```sh
+prowler iac --scan-path ./my-iac-directory --frameworks terraform kubernetes
+```
+
+### Exclude Paths
+
+```sh
+prowler iac --scan-path ./my-iac-directory --exclude-path ./my-iac-directory/test,./my-iac-directory/examples
+```
+
+## Output
+
+You can use the standard Prowler output options, for example:
+
+```sh
+prowler iac --scan-path ./iac --output-formats csv json html
+```
+
+## Notes
+
+- The IaC provider does not require cloud authentication.
+- It is ideal for CI/CD pipelines and local development environments.
+- For more details on supported frameworks and rules, see the [Checkov documentation](https://www.checkov.io/1.Welcome/Quick%20Start.html).