gitignore: add layout inspection artifacts

Change-Id: I1fe2cd6cc96dd276e10f3c1650481a944ed76bdd
diff --git a/.gitignore b/.gitignore
index 4671a2c..05565cb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@
 .gradle
 **/.settings
 config.mak
+ring-android/captures/