Document build dependencies
Document build dependencies

Signed-off-by: Randy Ramos <7e8ea25db4f903dc24bb11413a065a6bad1cf12c@gmail.com>
Signed-off-by: Lukas Fleischer <c9ca73f8336dcfb037ec2c2abf52d80a6847a5cd@calcurse.org>

lfos/calcurse,lfos/calcurse,lfos/calcurse