add docs/user/tutorials

docs/user/tutorials/01-10-simple-use.md

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+# Use Docker Registry
+
+This tutorial shows how you can push image to Docker Registry and use it
+
+## Steps
+
+1. Prepare simple image:
+
+    Save it as `simple.py`:
+    ```python
+    import time
+    import datetime
+
+    while True:
+      print("Current time:", datetime.datetime.now(), flush=True)
+      time.sleep(10)
+    ```
+
+    Save it as `Dockerfile` and build it:
+    ```dockerfile
+    FROM python:3-alpine
+
+    WORKDIR /usr/src/app
+
+    COPY simple.py .
+
+    CMD [ "python", "./simple.py" ]
+    ```
+
+    Build and push the image to Docker Registry:
+    ```bash
+    docker build -t simple-image .
+    ```
+
+2. Import image to Docker Registry:
+
+    <!-- TODO: presiquites: kyma cli (new version) -->
+    ```bash
+    kyma image-import simple-image:latest
+    ```
+
+3. Create pod using image from Docker Registry:
+
+    ```bash
+    kubectl run simple-pod --image=localhost:32137/simple-image:latest --overrides='{ "spec": { "imagePullSecrets": [ { "name": "dockerregistry-config" } ] } }'
+    ```
+
+4. Check if the pod is running:
+
+    Pod should be in `Running` state:
+    ```bash
+    kubectl get pods simple-pod
+    ```
+    Expected output:
+    ```
+    NAME         READY   STATUS    RESTARTS   AGE
+    simple-pod   1/1     Running   0          60s
+    ```
+
+    Python script (inside pod) should print current time every 10 seconds:
+    ```bash
+    kubectl logs simple-pod
+    ```
+    Expected output:
+    ```
+    Current time: 2024-05-17 11:23:34.957406
+    Current time: 2024-05-17 11:23:44.954583
+    Current time: 2024-05-17 11:23:54.956107
+    Current time: 2024-05-17 11:24:04.966306
+    ```

docs/user/tutorials/README.md

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+# Tutorials
+
+This section will help you understand how to use Docker Registry.