CoinGPT features:
1. Chat with AI bot powered with GPT3.5 turbo.
2. Login with saved credentials.
3. "CoinGPT coins" count for prompt request and response.
4. "CoinGPT coins" on top toolbar turns RED after reaching below 300 coins.
5. 10 seconds cool down between each prompt request sending to avoid spam.
6. Chat-history auto-saved feature.
7. File rename and deletion feature on Chat-history screen.
8. Google Play Billing support.