Edit gemspec and add initial files

Gemfile

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+source 'https://rubygems.org'
+gemspec

README.md

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-# Ruby Twirp
+# Ruby Twirp
+
+Twirp services and clients in Ruby.

lib/twirp.rb

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+require_relative 'twirp/version'
+require_relative 'twirp/error'

lib/twirp/error.rb

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+module Twirp
+	class Error
+  end
+end

lib/twirp/version.rb

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+module Twirp
+  VERSION = "0.0.1"
+end

twirp.gemspec

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+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+
+require 'twirp/version'
+
+Gem::Specification.new do |spec|
+  spec.name          = "twirp"
+  spec.version       = Twirp::VERSION
+  spec.authors       = ["Cyrus A. Forbes", "Mario Izquierdo"]
+  spec.email         = ["forbescyrus@gmail.com", "tothemario@gmail.com"]
+  spec.summary       = %q{Twirp services in Ruby.}
+  spec.description   = %q{Twirp is a simple RPC framework with protobuf service definitions. The Twirp gem provides support for Ruby.}
+  spec.homepage      = "https://github.com/cyrusaf/ruby-twirp"
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0")
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.require_paths = ["lib"]
+
+  spec.add_runtime_dependency 'google/protobuf', '>= 3.0.0'
+
+  spec.add_development_dependency 'bundler', '>= 1'
+end