docs: Add image that shows provisioning configuration

If the user does not find the "nRF Cloud Provisioning" rule,
they can now refer to the added image for guidance on the
provisioning configuration.

Signed-off-by: Simen S. Røstad <simen.rostad@nordicsemi.no>

Author: simensrostad

README.md

@@ -87,6 +87,15 @@ west flash --erase
 
 2. In nRF Cloud: **Security Services** → **Claimed Devices** → **Claim Device**
 3. Paste token, set rule to "nRF Cloud Onboarding", click **Claim Device**
+
+    <details>
+    <summary><strong>If "nRF Cloud Onboarding" rule is not showing:</strong></summary>
+
+    Create a new rule using the following configuration:
+
+    <img src="docs/images/claim.png" alt="Claim Device" width="300" />
+    </details>
+
 4. Wait for the device to provision credentials and connect to nRF Cloud over CoAP.
 
 See [Provisioning](docs/common/provisioning.md) for more details.

docs/common/provisioning.md

@@ -15,6 +15,14 @@ Device provisioning establishes credentials for secure communication with nRF Cl
 2. In nRF Cloud: **Security Services** → **Claimed Devices** → **Claim Device**
 3. Paste token, set rule to "nRF Cloud Onboarding", click **Claim Device**
 
+    <details>
+    <summary><strong>If "nRF Cloud Onboarding" rule is not showing:</strong></summary>
+
+    Create a new rule using the following configuration:
+
+   <img src="../images/claim.png" alt="Claim Device" width="300" />
+    </details>
+
 ### REST API Alternative
 
 ```bash