[2019][ruby] add rakefile

2019/ruby/Rakefile

@@ -0,0 +1,13 @@
+require "rake/testtask"
+
+task default: [:test, :srb]
+
+Rake::TestTask.new do |t|
+  t.libs << "test"
+  t.test_files = FileList["test_*.rb"]
+  t.verbose = true
+end
+
+task :srb do
+  sh "srb tc"
+end