custom plugins for pwnagotchi

1. If you have not set up a directory for custom plugins, create the directory and add its path to your config.toml. main.custom_plugins = "/usr/local/share/pwnagotchi/custom-plugins/"
2. Install dependencies
3. Put plugin to your custom folder
4. Edit your config.toml (if needed)
5. Restart pwnagotchi service

• MQTT Plugin
• memtemp_adv