add local variable spec

.rspec

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+--require spec_helper
+--format documentation

spec/basic/step01_variable_spec.rb

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+require 'spec_helper'
+
+describe 'Step01VariableTest' do
+  context 'local variable' do
+    # What string is sea variable at the method end?
+    # メソッド終了時の変数 sea の中身は？
+    it 'variable basic' do
+      sea = 'mystic'
+      log(sea) # your answer? => mystic
+    end
+
+    # Same as the previous method question. (前のメソッドの質問と同じ)
+    it 'variable initial' do
+      sea = 'mystic'
+      land = 8.to_s
+      piari = nil.to_s
+      dstore = 'mal'
+      sea = sea + land + piari + ':' + dstore
+      log(sea) # your answer? =>
+    end
+
+    # Same as the previous method question. (前のメソッドの質問と同じ)
+    it 'variable reassigned basic' do
+      sea = 'mystic'
+      land = 'oneman'
+      sea = land
+      land = land + "'s dreams"
+      log(sea) # your answer? =>
+    end
+
+    # Same as the previous method question. (前のメソッドの質問と同じ)
+    it 'variable reassigned int' do
+      sea = 94
+      land = 415
+      sea = land
+      land += 1
+      log(sea) # your answer? =>
+    end
+  end
+end

spec/spec_helper.rb

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+module SpecHelper
+  def log(messages)
+    puts(messages)
+  end
+end
+
+RSpec.configure do |config|
+  config.include SpecHelper
+end