feat: add template

Signed-off-by: Matej Focko <mfocko@redhat.com>

src/bin/.dayXX.rs

@@ -0,0 +1,27 @@
+use aoc_2023::*;
+
+type Output1 = i32;
+type Output2 = Output1;
+
+struct DayXX {}
+impl Solution<Output1, Output2> for DayXX {
+    fn new<P: AsRef<Path>>(pathname: P) -> Self {
+        let lines: Vec<String> = file_to_lines(pathname);
+
+        todo!()
+    }
+
+    fn part_1(&mut self) -> Output1 {
+        todo!()
+    }
+
+    fn part_2(&mut self) -> Output2 {
+        todo!()
+    }
+}
+
+fn main() -> Result<()> {
+    DayXX::main()
+}
+
+test_sample!(day_XX, DayXX, 0, 0);