How will Bitcoin be bought? The best thing you can do is an interface to trading platforms or referral links to popular platforms, but providing a direct purchase option would be dangerous for users, and you need to get some confidence before considering putting it up.
Many people prefer browsing websites to downloading applications, so focus on the site and when you gain sufficient confidence and traffic, you can create an application.
The site is mostly informative and teaches people not only how to invest in bitcoin but also how and where they can buy bitcoin for themselves. I'm always open to learning how I can improve it for the user's experience.