Add .editorconfig

.editorconfig

@@ -0,0 +1,10 @@
+[*]
+charset=utf-8
+end_of_line=lf
+indent_style=space
+indent_size=4
+max_line_length=79
+
+[{.babelrc,.stylelintrc,jest.config,.eslintrc,*.bowerrc,*.jsb3,*.jsb2,*.json,*.js}]
+indent_style=space
+indent_size=2