diff --git a/source/hello/service.crud b/source/hello/service.crud
new file mode 100644
index 0000000..c2c5c69
--- /dev/null
+++ b/source/hello/service.crud
@@ -0,0 +1,2 @@
+fn add(a: string, b: string) -> string:
+    a + " " + b
\ No newline at end of file