040000 tree 37b8d73a82021aefec8fb7235084faae73f503a6	01how-to-contribute
040000 tree 489667d0b2dc7c9ae02a291a5c1f535125b6ab6c	02code-guidelines
040000 tree c7287c0bde3241f7da174b6d7c27a20f28705835	03pull-request
040000 tree 4c049f40d95491b14c4799ef9ec63f3f568e5b61	04release-manual