Add development tooling and build system

- Add bin/console for interactive development
- Add bin/setup for easy project setup
- Add Makefile for gem building
- Provide development workflow tools

Author: devjoaov

Makefile

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+build:
+	gem build mustachio-ruby.gemspec

bin/console

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "bundler/setup"
+require "mustachio_ruby"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+require "irb"
+IRB.start(__FILE__)

bin/setup

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+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install