add ratings file to tessdata

Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/tessdata/ratings b/tessdata/ratings
new file mode 100644
index 0000000..befda21
--- /dev/null
+++ b/tessdata/ratings
@@ -0,0 +1,2 @@
+display_ratings 1
+tessedit_write_images 1