move old files to a separate directory

old_curriculum/macros/macros2.rs

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+// macros2.rs
+// Make me compile! Scroll down for hints :)
+
+fn main() {
+    my_macro!();
+}
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+macro_rules! my_macro {
+    () => {
+        println!("Check out my macro!");
+    };
+}
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+// Macros don't quite play by the same rules as the rest of Rust, in terms of
+// what's available where.
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+// Unlike other things in Rust, the order of "where you define a macro" versus
+// "where you use it" actually matters.