add .editorconfig

.editorconfig

@@ -0,0 +1,23 @@
+[*]
+charset=utf-8
+end_of_line=lf
+insert_final_newline=false
+indent_style=space
+indent_size=4
+
+[{composer.lock,.babelrc,.stylelintrc,.eslintrc,jest.config,*.bowerrc,*.jsb3,*.jsb2,*.json}]
+indent_style=space
+indent_size=2
+
+[{Makefile.*,Makefile,GNUmakefile,makefile,*.mk}]
+indent_style=tab
+tab_width=4
+
+[{*.module,*.hphp,*.phtml,*.php5,*.php4,*.php,*.inc}]
+indent_style=tab
+tab_width=4
+
+[{*.yml,*.yaml}]
+indent_style=space
+indent_size=2
+