Update README

README.md

-# Pytest
+# Pytest template
+
+## Objective
+
+This template is for run tests with pytest.
+
+## How to use it
+
+1. Include the pytest template in your GitLab CI/CD configuration.
+2. If you need to customize the job, refer to
+   the [jobs customization](https://docs.r2devops.io/get-started/use-templates/#job-templates-customization)
+   documentation.
+
+## Variables
+
+| Name                       | Description                                                                                                                                                   | Default                                                                  |
+|----------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------|
+| `PROJECT_PATH`             | The path to the project root directory.                                                                                                                       | `"."`                                                                    |