move old files to a separate directory

old_curriculum/modules/modules1.rs

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+// modules1.rs
+// Make me compile! Scroll down for hints :)
+
+mod sausage_factory {
+    fn make_sausage() {
+        println!("sausage!");
+    }
+}
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+fn main() {
+    sausage_factory::make_sausage();
+}
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+// Everything is private in Rust by default-- but there's a keyword we can use
+// to make something public! The compiler error should point to the thing that
+// needs to be public.