I have sold a source code, and he ask me to create a account there.
That's why I'm checking here before do anything.
If I understand this correctly, you sold software to someone for 16 BTC, and they are telling you to open an account at that site so they can send you the BTC. The person or the site requires you to deposit 0.02 BTC before you can get your money.
If that is correct, then it is almost certainly a scam, including the 16 BTC payment.
What to do:
1. Create an account at a
reputable and well-known site or exchange, such as Coinbase, or install a
recommended wallet on your computer or mobile.
2. Give the person sending you the BTC a receive address from your wallet or a receive/deposit address from the site.
3. If they object to that or require you to send them money first, or ask you for a private key or seed or login information, then it is all a scam.
4. If they send you the money, then everything is fine.