Updating readme with troubleshooting section (Azure#21205)

sdk/appconfiguration/app-configuration/README.md

@@ -175,6 +175,20 @@ async function run() {
 run().catch((err) => console.log("ERROR:", err));
 ```
 
+## Troubleshooting
+
+### Logging
+
+Enabling logging may help uncover useful information about failures. In order to see a log of HTTP requests and responses, set the `AZURE_LOG_LEVEL` environment variable to `info`. Alternatively, logging can be enabled at runtime by calling `setLogLevel` in the `@azure/logger`:
+
+```javascript
+import { setLogLevel } from "@azure/logger";
+
+setLogLevel("info");
+```
+
+For more detailed instructions on how to enable logs, you can look at the [@azure/logger package docs](https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/logger).
+
 ## Next steps
 
 The following samples show you the various ways you can interact with App Configuration: