Ether_header struct added

Author: massoudasadi

LibcSharp/Structs.cs

@@ -0,0 +1,15 @@
+using System.Runtime.InteropServices;
+
+namespace LibcSharp;
+
+[StructLayout(LayoutKind.Sequential, Pack = 1)]
+public struct Ether_header
+{
+    [MarshalAs(UnmanagedType.ByValArray, SizeConst = Constants.ETH_ALEN)]
+    public byte[] ether_dhost; // destination eth addr
+
+    [MarshalAs(UnmanagedType.ByValArray, SizeConst = Constants.ETH_ALEN)]
+    public byte[] ether_shost; // source ether addr
+
+    public ushort ether_type; // packet type ID field
+}