Add .editorconfig

Author: Tiago Azevedo

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js}]
+charset = utf-8
+indent_style = space
+indent_size = 2