Added a section on proxying to the contributor docs (#40)

* Added a section on proxying to the contibutor docs

* Changed wording

.github/CONTRIBUTING.md

@@ -65,6 +65,8 @@ There are more details about processes and workflow in the [Maintainer's Guide](
 
 ### Frontend
 
+#### Starting the frontend
+
 1. Install dependencies
 
    ```bash
@@ -89,6 +91,19 @@ There are more details about processes and workflow in the [Maintainer's Guide](
    yarn build
    ```
 
+#### Proxying
+Depending on your setup, it may be advantageous for you to setup a proxy from your
+local machine to a KalDB query node running in a cloud environment. Below is
+an example command to do that (NOTE: this may or may not work depending on 
+your setup):
+```
+ssh -N -L $LOCALHOST_PORT:localhost:$REMOTE_PORT $NODE_NAME
+```
+
+You would then be able to use `host.docker.internal:$LOCALHOST_PORT` as the 
+KalDB datasource URL inside your Grafana instance.
+
+
 ### Backend
 
 1. Update [Grafana plugin SDK for Go](https://grafana.com/docs/grafana/latest/developers/plugins/backend/grafana-plugin-sdk-for-go/) dependency to the latest minor version: