move old files to a separate directory

old_curriculum/macros/macros3.rs

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+// macros3.rs
+// Make me compile, without taking the macro out of the module! Scroll down for hints :)
+
+mod macros {
+    macro_rules! my_macro {
+        () => {
+            println!("Check out my macro!");
+        };
+    }
+}
+
+fn main() {
+    my_macro!();
+}
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+// In order to use a macro outside of its module, you need to do something
+// special to the module to lift the macro out into its parent.
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+// The same trick also works on "extern crate" statements for crates that have
+// exported macros, if you've seen any of those around.