add: 头歌上的隐藏测试集 (#82)

Reviewed-on: PostGuard/Canon#82

open_set/73_param_name.pas

@@ -0,0 +1,13 @@
+program main;
+var ret:integer;
+
+function Fn(f: integer): integer;
+begin
+    Fn := f * 2;
+end;
+
+begin
+    ret := 0;
+    ret := Fn(10);
+    write(ret);
+end.