update README to include branch descriptions
update README to include branch descriptions

yorung/XLE,yorung/XLE,xlgames-inc/XLE,yorung/XLE,yorung/XLE,yorung/XLE,xlgames-inc/XLE,xlgames-inc/XLE,xlgames-inc/XLE,xlgames-inc/XLE,xlgames-inc/XLE,xlgames-inc/XLE,yorung/XLE,yorung/XLE,yorung/XLE,xlgames-inc/XLE