Sample Templates: Exclude README-* from output

Avoids outputting /README-wear.txt in Clockwork samples.

Change-Id: Ie755d43c37393e73999b225af1860b1ef0fe49d4
diff --git a/build.gradle b/build.gradle
index 8696bac..0d23cdc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -136,6 +136,7 @@
         exclude "**/build"
         exclude "**/proguard-project.txt"
         exclude "${samplegen.targetSampleModule()}/**/README*.txt"
+        exclude "**/README-*.txt"
 
         // src directory needs to be consolidated, will be done in next section
         exclude "${samplegen.targetSampleModule()}/src/"