Add day 1 solution

day1/input.txt

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+84878

day1/main.py

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+#!/usr/bin/env python3
+
+
+def part1():
+    with open('input.txt', 'r') as f:
+        print(sum(int(line)//3 - 2 for line in f))
+
+
+def part2():
+    with open('input.txt', 'r') as f:
+        modules = [int(line) for line in f]
+
+    total = 0
+    for module in modules:
+        next_cost = module//3 - 2
+        while next_cost >= 0:
+            total += next_cost
+            next_cost = next_cost // 3 - 2
+
+    print(total)
+
+
+if __name__ == '__main__':
+    part1()
+    part2()