add initial exe

Signed-off-by: Daijiro Fukuda <fukuda@clear-code.com>

Author: daipom

exe/tailcheck

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'fluent/tail_checker'
+
+Fluent::TailChecker.run

lib/fluent/tail_checker.rb

@@ -4,7 +4,8 @@
 
 module Fluent
   module TailChecker
-    class Error < StandardError; end
-    # Your code goes here...
+    def self.run
+      puts Fluent::TailChecker::VERSION
+    end
   end
 end