Add Rust solutions for days 1-3

Signed-off-by: Alek Ratzloff <alekr@jsausa.com>

day04/Day04.rs

@@ -0,0 +1,11 @@
+//use std::io::{self, Read};
+
+//type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+fn main() {
+    part1(246515, 739105);
+}
+
+fn part1(lower: usize, upper: usize) {
+
+}