add comment for tutorial 03 on windows build: need copy source out fr…

…om ndk dir in order to build

README.md

@@ -1,7 +1,7 @@
 Tutorial Samples
 ================
 A set of samples to illustrate Vulkan API on Android with Android Studio		
-To build on windows for tutorial02, copy/install ndk-r12 ( or better ) to a directory close to root dir ( c: ) to workaround command path 260 character limit issue;see totorial02's build.gradle for details
+To build on windows for tutorial02/03, copy/install ndk-r12 ( or better ) to a directory close to root dir ( c: ) to workaround command path 260 character limit issue;see totorial02/03's build.gradle for details
 
 Other Resources:	
 Additional Android Studio/NDK samples:    

tutorial03_traceable_layers/README.md

@@ -4,5 +4,10 @@ Add gradle build for validation layers as app's jniLib dependencies
 so inaries are packed into APK automatically and traceale at run-time
 (layers could be stepped into when debugging application)
 Enable all validation layers/extensions found on the system
-Using vulkan wrappers in common/vulkan_wrapper directory
+Using vulkan wrappers in common/vulkan_wrapper directory	
+**Windows build extra steps**	
+if you see errors while building validation layers, try the following workaround:	
+- copy your ndk to be directly under c:\
+- configure your ndk.dir inside local.properties to your new ndk location
+this is due to the fact that commend path is above 260 when source is inside ndk
 

tutorial03_traceable_layers/app/build.gradle

@@ -50,6 +50,10 @@ model {
                         srcDir '../../common/vulkan_wrapper'
                     }
                 }
+                // To build on windows, must shorten the source directly path
+                // one way is to copy your ndk to c:\ directory [c:\ndk-r12], and confogure new location to ndk.dir in local.properties
+                // the other way is to just copy layers source out from ndk\sources\third_party\vulkan to c:\vulkan.
+                // Linux / Mac build should work as without any changes
                 jniLibs {
                     dependencies {
                         project ":threading"