Add solution for "Day 9: Movie Theater", part 1

tests/full_data.rs

@@ -40,3 +40,11 @@ fn playground() {
         )
     );
 }
+
+#[test]
+fn movie_theater() {
+    assert_eq!(
+        Ok((4781235324, 0)),
+        solvers::run_solver(solvers::movie_theater::MovieTheater {}, &solvers::DATA_PATHS)
+    );
+}