add macros examples

macros/macros1.rs

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+// Make me compile! Scroll down for hints :)
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+macro_rules! my_macro {
+    () => {
+        println!("Check out my macro!");
+    };
+}
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+fn main() {
+    my_macro();
+}
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+// When you call a macro, you need to add something special compared to a regular function call. If
+// you're stuck, take a look at what's inside `my_macro`.