Initial 2021 runner

2021/src/day01.rs

@@ -0,0 +1,10 @@
+use crate::Solution;
+
+#[derive(Default)]
+pub struct Day01;
+
+impl Solution for Day01 {
+    fn part1(&mut self, _input: &mut dyn std::io::Read) -> String {
+        todo!()
+    }
+}