Add assembly description string.

Refers to #2

ATxTray/Properties/AssemblyInfo.cs

@@ -6,7 +6,7 @@ using System.Runtime.InteropServices;
 // set of attributes. Change these attribute values to modify the information
 // associated with an assembly.
 [assembly: AssemblyTitle("ATxTray")]
-[assembly: AssemblyDescription("")]
+[assembly: AssemblyDescription("AutoTx Tray Monitor")]
 [assembly: AssemblyConfiguration("")]
 [assembly: AssemblyCompany("Universitaet Basel")]
 [assembly: AssemblyProduct("ATxTray")]