Added package jsons to mods + updated related poco

ExampleMods/Mods/7UseMultipleClasses/SecondClass.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExampleMods.Mods._7UseMultipleClasses
+{
+    public class SecondClass
+    {
+        public string GetText()
+        {
+            return "test text";
+        }
+    }
+}