setup for day1 of aoc

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+

2020/day_1/Cargo.toml

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+[package]
+name = "day_1"
+version = "0.1.0"
+authors = ["Ray Slakinski <ray.slakinski@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2020/day_1/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}