[Add] FishNet

Assets/FishNet/Demos/SceneManager/Additive Scenes/ReadMe.txt

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+This demo shows how to use additive scenes per connection, both prewarming scenes on the server
+as well hot-loading and unloading them on clients. AOI is separated by scenes and objects in
+each scene, as well relative distance to the player.
+
+Setup:
+	* Place scenes in build settings, AdditiveScene_Start first, then the remainder scenes.
+	* Start on AdditiveScene_Start for server and client.
+
+On server:
+	* Start/press play and start server.
+
+On client:
+	* Start/press play and start client.
+
+
+Notes:
+	* All scenes are loaded immediately on the server using ServerScenePrewarmer.
+            When loaded they are marked to not automatically unload, and KeepUnused when unloading.
+            See ServerScenePrewarmer and LeveLoader notes for more details.
+
+	* The Player script is only used to move the player object on the server. It has no functionality
+            on the scene management. Waypoint is only used to tell the player where to move.
+
+	* Demo works as clientHost as well server or client only. Load multiple clients to see the
+            Observer system work on moving objects across different scenes!
+
+	* See NetworkManager > ObserverManager in AdditiveScene_Start to view ObserverConditions.