added simple guardfile

Guardfile

@@ -0,0 +1,15 @@
+# A sample Guardfile
+# More info at https://github.com/guard/guard#readme
+
+guard 'bundler' do
+  watch('Gemfile')
+  # Uncomment next line if Gemfile contain `gemspec' command
+  watch(/^.+\.gemspec/)
+end
+
+guard 'rspec', :version => 2 do
+  watch(%r{^spec/.+_spec\.rb$})
+  watch(%r{^lib/(.+)\.rb$})     { |m| "spec/lib/#{m[1]}_spec.rb" }
+  watch('spec/spec_helper.rb')  { "spec" }
+end
+