Add new VS AddIn examples

visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs

Index: visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs
diff --git a/visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs b/visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs
index 3541a0ba47e45fb0034ed0d9d324ba35c952c74a..efa26d00251e1a3cf81985ad3aedcd1f8f657ac1 100644
--- a/visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs
+++ b/visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs
@@ -233,12 +233,18 @@ namespace NativeClientVSAddIn
       }
     }
 
+    /// <summary>
+    /// Return true if the given platform is a NaCl platform.
+    /// </summary>
     public static bool IsNaClPlatform(string platformName)
     {
         return platformName.Equals(Strings.NaCl32PlatformName, StringComparison.OrdinalIgnoreCase) ||
                platformName.Equals(Strings.NaCl64PlatformName, StringComparison.OrdinalIgnoreCase);
     }
 
+    /// <summary>
+    /// Return true if the given platform is a PPAPI platform.
+    /// </summary>
     public static bool IsPepperPlatform(string platformName)
     {
         return platformName.Equals(Strings.PepperPlatformName, StringComparison.OrdinalIgnoreCase);