Add youplot as an executable file

exe/youplot

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'youplot'
+
+YouPlot::Command.new.run

youplot.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |spec|
 
   spec.files         = Dir['*.{md,txt}', '{lib,exe}/**/*']
   spec.bindir        = 'exe'
-  spec.executables   = ['uplot']
+  spec.executables   = ['uplot', 'youplot']
   spec.require_paths = ['lib']
 
   spec.add_runtime_dependency 'unicode_plot'