Add skeleton .editorconfig file

See http://editorconfig.org/

[ci skip]

Signed-off-by: Alex Coles <alex@alexbcoles.com>

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,rb}]
+charset = utf-8
+indent_style = space
+indent_size = 2