Added Day 1 Part 1 and it's input

.gitignore

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+target/*

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "aoc2020"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "aoc2020"
+version = "0.1.0"
+authors = ["Ishan Jain <contact@ishanjain.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

input

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+

src/main.rs

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+use std::collections::HashSet;
+use std::io::{stdin, Read};
+
+fn main() {
+    let mut input = String::new();
+    stdin().read_to_string(&mut input).unwrap();
+
+    let numbers: HashSet<u64> = input
+        .split('\n')
+        .filter(|x| !x.is_empty())
+        .map(|x| x.parse::<u64>().unwrap())
+        .collect();
+
+    for &num in numbers.iter() {
+        if numbers.contains(&(2020 - num)) {
+            println!("{}", num * (2020 - num));
+            break;
+        }
+    }
+}