add a test

exercises/test1.rs

@@ -0,0 +1,15 @@
+// test1.rs
+// Make me compile! Scroll down for hints :)
+
+fn something() -> [f32; 120] {
+    ???
+}
+
+fn something_else() -> String {
+    ???
+}
+
+fn main() {
+    println!("This array is {} items long, and it should be 120", something().len()); 
+    println!("This function returns a string: {}", something_else());
+}