readme update

Author: piotrek98

README.md

@@ -22,7 +22,7 @@ new TraceoClient({
 });
 ```
 
-`TraceoClient` options require two parameters. `appId` is a unique identifier of an application created on the Traceo platform. `url` parameter specifies the address where your Traceo Platform instance is located. Address should be passed in the format `<protocol>://<domain>:<port>`, eq. `http://localhost:3000`.
+`TraceoClient` options require two parameters. `appId` is a unique identifier of an application created on the Traceo platform. Information about application ID you can get from the Traceo Platform in `Settings|Details` tab.  `url` parameter specifies the address where your Traceo Platform instance is located. Address should be passed in the format `<protocol>://<domain>:<port>`, eq. `http://localhost:3000`.
 
 ### Incidents handling
 Incidents are all the exceptions and other problems that occur in your application. After each exception occurs, the Traceo SDK catches the exception and sends it to the Traceo Platform. This package provide the two main ways to catch exceptions in your application - `Handlers` and `Middlewares`.