Sample Build: Add handling for README files in build gradle

Change-Id: I1e749ad8fe3abcefe42c1fb7a1c5c74a1e5301ce
diff --git a/build.gradle b/build.gradle
index d888c03..248527f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -132,7 +132,9 @@
         exclude "buildSrc"
         exclude "local.properties"
         exclude "template-params.xml"
+        exclude "**/build"
         exclude "**/proguard-project.txt"
+        exclude "${samplegen.targetSampleModule()}/**/README*.txt"
 
         // src directory needs to be consolidated, will be done in next section
         exclude "${samplegen.targetSampleModule()}/src/"