added instructions to perception camera doc

com.unity.perception/Documentation~/PerceptionCamera.md

 |--|--|
 | Affect Simulation Timing | Have this camera affect simulation timings (similar to a scheduled camera) by requesting a specific frame delta time. Enabling this option will let you set the `Simulation Delta Time` property described above.|
 
+## Output resolution
+When using Unity Editor to generate datasets, the resolution of the images generated by the Perception Camera will match the resolution set for the ***Game*** view of the editor. However, images generated with built players (including local builds and Unity Simulation runs) will use the resolution specified in project settings. 
+
+* To set the resolution of the ***Game*** view, click on the dropdown menu in front of `Display 1`. You can use one of the provided resolutions or create a new one. To create one, click **+**. Set `Type` to `Fixed Resolution` and `Width` and `Height` to your desired resolution.
+
+<p align="center">
+<img src="images/gameview_res.png" width="300"/>
+  <br><i>Creating a new resolution preset for the ***Game*** view</i>
+</p>
+
+* To set the resolution of the built player, Open ***Edit -> Project Settings*** and navigate to the ***Player*** tab. In the ***Resolution and Presentation*** section, set ***Fullscreen Mode*** to ***Windowed*** and then set ***Default Screen Width*** and ***Default Screen Height*** to your desired resolution.
+
+<p align="center">
+<img src="images/build_res.png" width="700"/>
+  <br><i>Setting the resolution of the built player</i>
+</p>
 
 ## Camera labelers
 Camera labelers capture data related to the Camera in the JSON dataset. You can use this data to train models and for dataset statistics. The Perception package provides several Camera labelers, and you can derive from the CameraLabeler class to define more labelers.