Re-organize all projects (#4166)

Content.Server/Radio/Components/IRadio.cs

@@ -0,0 +1,14 @@
+using System.Collections.Generic;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Radio.Components
+{
+    public interface IRadio
+    {
+        IReadOnlyList<int> Channels { get; }
+
+        void Receive(string message, int channel, IEntity speaker);
+
+        void Broadcast(string message, IEntity speaker);
+    }
+}