docs: show how to embed gum in python and ruby scripts

examples/gum.py

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+import subprocess
+
+print("What's your favorite language?")
+
+result = subprocess.run(["gum", "choose", "Go", "Python"], stdout=subprocess.PIPE, text=True)
+
+print(f"I like {result.stdout.strip()}, too!")

examples/gum.rb

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+puts 'What is your name?'
+name = `gum input --placeholder "Your name"`.chomp
+
+puts "Hello #{name}!"
+
+puts 'Pick your 2 favorite colors'
+
+COLORS = {
+  'Red' => '#FF0000',
+  'Blue' => '#0000FF',
+  'Green' => '#00FF00',
+  'Yellow' => '#FFFF00',
+  'Orange' => '#FFA500',
+  'Purple' => '#800080',
+  'Pink' => '#FF00FF'
+}.freeze
+
+colors = `gum choose #{COLORS.keys.join(' ')} --limit 2`.chomp.split("\n")
+
+if colors.length == 2
+  first = `gum style --foreground '#{COLORS[colors[0]]}' '#{colors[0]}'`.chomp
+  second = `gum style --foreground '#{COLORS[colors[1]]}' '#{colors[1]}'`.chomp
+  puts "You chose #{first} and #{second}."
+elsif colors.length == 1
+  first = `gum style --foreground '#{COLORS[colors[0]]}' '#{colors[0]}'`.chomp
+  puts "You chose #{first}."
+else
+  puts "You didn't pick any colors!"
+end