add editor config

Author: tureki

.editorconfig

@@ -0,0 +1,21 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,jsx}]
+charset = utf-8
+indent_size = 2
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2