Add EditorConfig file for Ruby files

.editorconfig

@@ -0,0 +1,22 @@
+; This file is for unifying the coding style for different editors and IDEs.
+; More information at http://EditorConfig.org
+
+root = true
+
+; Use 2 spaces for indentation in all Ruby files
+
+[*.rb]
+indent_style = space
+indent_size = 2
+
+[Rakefile]
+indent_style = space
+indent_size = 2
+
+[Gemfile*]
+indent_style = space
+indent_size = 2
+
+[config.ru]
+indent_style = space
+indent_size = 2