Initial split of the modules

NadekoBot.Module.Searches/Common/Exceptions/StreamNotFoundException.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace NadekoBot.Modules.Searches.Common.Exceptions
+{
+    public class StreamNotFoundException : Exception
+    {
+        public StreamNotFoundException(string message) : base($"Stream '{message}' not found.")
+        {
+        }
+    }
+}