Add model serving test doc

Signed-off-by: David Kornel <[email protected]>

docs/md/io/odh/test/e2e/standard/ModelServingST.md

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+# ModelServingST
+
+**Description:** Verifies simple setup of ODH for model serving by spin-up operator, setup DSCI, and setup DSC.
+
+**Before tests execution steps:**
+
+| Step | Action | Result |
+| - | - | - |
+| 1. | Deploy Pipelines Operator | Pipelines operator is available on the cluster |
+| 2. | Deploy ServiceMesh Operator | ServiceMesh operator is available on the cluster |
+| 3. | Deploy Serverless Operator | Serverless operator is available on the cluster |
+| 4. | Install ODH operator | Operator is up and running and is able to serve it's operands |
+| 5. | Deploy DSCI | DSCI is created and ready |
+| 6. | Deploy DSC | DSC is created and ready |
+
+**After tests execution steps:**
+
+| Step | Action | Result |
+| - | - | - |
+| 1. | Delete ODH operator and all created resources | Operator is removed and all other resources as well |
+
+<hr style="border:1px solid">
+
+## testMultiModelServerInference
+
+**Description:** Check that user can create, run inference and delete MultiModelServing server from a DataScience project
+
+**Contact:** `Jiri Danek <[email protected]>`
+
+**Steps:**
+
+| Step | Action | Result |
+| - | - | - |
+| 1. | Create namespace for ServingRuntime application with proper name, labels and annotations | Namespace is created |
+| 2. | Create a serving runtime using the processModelServerTemplate method | Serving runtime instance has been created |
+| 3. | Create a secret that exists, even though it contains no useful information | Secret has been created |
+| 4. | Create an inference service | Inference service has been created |
+| 5. | Perform model inference through the route | The model inference execution has been successful |
+| 6. | Delete the Inference Service | The Inference service has been deleted |
+| 7. | Delete the secret | The secret has been deleted |
+| 8. | Delete the serving runtime | The serving runtime has been deleted |
+