I have said before, it is very difficult to get BTC in Turkey and Paypal has also shut down its service to Turkey. A new emerging exchange site created a wallet with 0 commission from the android application card. I sent $ 5 to try the direct account. I got btc from the company of the company. I would suggest that you consider a similar system. Especially if you accept the Turkish lira money transfer.
I dont think it will be possible to add a particular country's currency But I too will support the idea of adding money from credit cards into the site while buying BTC. I have heard American Express provides such kind of service with other less marketed currencies. Adding Lira, Rupees, Piso and Dinar would be a unique feature to have.