Hi, I programmed a badminton match for the "STROMBERG: Büro ist Krieg" game:
(See my portfolio for more images and the trailer)
Try first to set up the field, implement the rule set for 1:1 and/or 2:2, add ball physics, write a player behaviour and try to find a good control scheme. I think developing the player controls was the most hardest part because I found no decent badminton game...
Best regards,
-- Christian