Add Shlink sample bundle docs

docs/samples/shlink.md

@@ -0,0 +1,43 @@
+## Using the Shlink sample bundle
+
+The Shlink example bundle in `samples/shlink-list-short-urls` demonstrates the ability to control a [Shlink](https://shlink.io/) server by getting the amount of short urls configured on the server. Here is a guide on how to get it working.
+
+### Prerequisites
+
+-   Working NodeCG & nodecg-io installation
+-   [Shlink server and valid API key / token for it](https://shlink.io/documentation/install-docker-image/)
+
+### Configure the Shlink sample bundle
+
+1. Start nodecg with nodecg-io installed. The shlink-list-short-urls bundle is currently part of it so it should also be loaded.
+
+2. Go to the `nodecg-io` tab in the nodecg dashboard.
+
+3. Login using your password. If this is your first run, then enter the password with which you want to encrypt your configurations and credentials.
+
+4. Create a new Shlink service instance using the left upper menu.
+
+5. Enter the configuration for Shlink.
+
+    The created instance should be automatically selected, if not, select it in the upper left menu. Enter the connection information for the Shlink server in monaco (the text-editor on the right) in this format:
+
+    ```json
+    {
+        "url": "https://example.com",
+        "apiKey": "1ae89449-f8d2-4b44-baf7-dd7eb0b05017"
+    }
+    ```
+
+    After entering it, click save.
+
+    _Note:_ If you don't see monaco on the right, try reloading the page.
+
+6. Set the created Shlink service instance to the service dependency of the shlink-list-short-urls bundle.
+
+    Select the shlink-list-short-urls bundle and the Shlink service in the left bottom menu and then select the service instance that should be used by the shlink-list-short-urls bundle (in this case the name of the previously created Shlink instance).
+
+7. Check the nodecg logs
+
+    You should see an error or a success message and the amount of configured short urls on the Shlink server.
+
+    _Note:_ When listing short urls - like this sample does - be aware that the amount of short urls might be limited by the [API key role](https://shlink.io/documentation/api-docs/api-key-roles/).

mkdocs.yml

@@ -77,6 +77,7 @@ nav:
                 - sACN Receiver sample: samples/sacn-receiver.md
                 - sACN Sender sample: samples/sacn-sender.md
           - Serial sample: samples/serial.md
+          - Shlink sample: samples/shlink.md
           - Slack sample: samples/slack.md
           - Spotify sample: samples/spotify.md
           - SQL sample: samples/sql.md