Add EditorConfig file

Author: Watson1978

.editorconfig

@@ -0,0 +1,14 @@
+# EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs
+# @see http://editorconfig.org
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+tab_width = 4
+
+[*.{rb,yml,yaml,md,conf}]
+indent_size = 2