In the .env file located at the root of the project directory specify DISCORD_TOKEN, CLIENT_ID and GUILD_ID each on the new line without spaces like so:
DISCORD_TOKEN=MTE...G2Q
CLIENT_ID=112...774
GUILD_ID=867...729
GREETING_CHANNEL_ID=724...113
assets/ folder structure
assets
├──audio
│ ├──birthday
│ ├──voice_commands
│ │ ...
│ └──greeting.mp3
└──images
└──temp
└──captha.png