Add Makefile shortcuts

2020/Makefile

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+.DEFAULT_GOAL=day
+DAY=0
+
+.PHONY: day
+day:
+	mkdir 'day$(DAY)'
+	sed 's/DayX/Day$(DAY)/g' template.ex > 'day$(DAY)/day$(DAY).ex'
+	touch 'day$(DAY)/input'
+
+.PHONY: watch
+watch:
+	ls 'day$(DAY)/day$(DAY).ex' | entr -c elixir /_

2020/template.ex

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+defmodule DayX do
+  defp read_input do
+    Path.expand('input', Path.dirname(__ENV__.file))
+    |> File.read!()
+  end
+
+  def part1 do
+    read_input()
+  end
+end
+
+DayX.part1() |> IO.inspect()