chore: Add e2e test docs (#172)

related issue:
kyma-project/lifecycle-manager#304

---------

Co-authored-by: Małgorzata Świeca <malgorzata.swieca@sap.com>

docs/README.md

@@ -5,3 +5,5 @@
 This folder contains documents that relate to the project.
 
 > In this document, provide the list of all documents that this folder contains, together with links to those documents and short information on what they describe.
+
+- [Enhanced Deployment Configuration Template for End-to-End Testing](e2e-test.md) - describes how to configure the template operator to fulfill certain e2e test scenarios.

docs/e2e-test.md

@@ -0,0 +1,17 @@
+# Enhanced Deployment Configuration Template for End-to-End Testing
+
+This document outlines how to use arguments to imitate specific module behavior to support certain end-to-end (e2e) test scenarios.
+
+- `final-state`
+
+   This argument allows customization of the final state of a Module CR (`sample-yaml`). By default, a Module CR transitions to the `Ready` state. However, the final state can be configured to differ from this default.
+
+   For instance, to override the final state to `Warning`, add `--final-state=Warning` as a deployment argument. In this case, once the Module CR is deployed, it remains in the `Warning` state.
+
+- `final-deletion-state`
+
+   This argument is used to customize the final state of a Module CR (`sample-yaml`) when the CR is flagged for deletion. The default state in this case is `Deleting`.
+
+## Related End-to-End Tests:
+
+- [Warning Status Propagation](https://github.com/kyma-project/lifecycle-manager/blob/a0c49436f3d11d03c9a7556ec11c7c9f69d621d9/tests/e2e/warning_status_propagation_test.go#L17) - in this test scenario the `final-state` and `final-deletion-state` arguments are used to set the Module CR's final state to `Warning`.