add practice projects

practices/hello-package/src/front_of_house/serving.rs

@@ -0,0 +1,9 @@
+pub fn take_order() {}
+
+pub fn serve_order() {}
+
+pub fn take_payment() {}
+
+// Maybe you don't want the guest hearing the your complaining about them
+// So just make it private
+fn complain() {}