Adding index entry in readme

(cherry picked from commit 7d79d78)

Author: LPLafontaineB

README.md

@@ -252,6 +252,7 @@ Running the game over internet currently requires setting up a relay.
 * Client authority - [Packages/com.unity.multiplayer.samples.coop/Utilities/Net/ClientAuthority/](Packages/com.unity.multiplayer.samples.coop/Utilities/Net/ClientAuthority/)
 * Scene utils with synced loading screens - [Packages/com.unity.multiplayer.samples.coop/Utilities/SceneManagement/ ](Packages/com.unity.multiplayer.samples.coop/Utilities/SceneManagement/)
 * RNSM custom config - [Packages/com.unity.multiplayer.samples.coop/Utilities/Net/RNSM/CustomNetStatsMonitorConfiguration.asset ](Packages/com.unity.multiplayer.samples.coop/Utilities/Net/RNSM/CustomNetStatsMonitorConfiguration.asset)
+* NetworkSimulator usage through UI - [Assets/Scripts/Gameplay/UI/NetworkSimulationUIMediator.cs]
 * ParrelSync - [ Packages/manifest.json ](Packages/manifest.json)
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