Revert "deleted caravel"

This reverts commit eb51f176d78190397930389940e5aeca28b393d7.
diff --git a/caravel b/caravel
new file mode 160000
index 0000000..de98d51
--- /dev/null
+++ b/caravel
@@ -0,0 +1 @@
+Subproject commit de98d514aa6c642ef020876a64c4cdb2c9ea9a8a