Add FishNet network library

Assets/FishNet/Runtime/Managing/Observing/LevelOfDetail.cs

@@ -0,0 +1,19 @@
+namespace FishNet.Managing.Observing
+{
+
+    /// <summary>
+    /// A configuration which affects the level of detail for a connection.
+    /// </summary>
+    public struct LevelOfDetail
+    {
+        /// <summary>
+        /// How often data will send when on this level of detail.
+        /// </summary>
+        public ushort SendInterval;
+
+        /// <summary>
+        /// Distance a connection's objects must be within to use this LevelOfDetail.
+        /// </summary>
+        public ushort Distance;
+    }
+}