add /version command

app/main.go

@@ -53,6 +53,12 @@ func main() {
 				},
 			},
 		},
+		{
+			Name:                     "version",
+			Description:              "Show application version",
+			DefaultMemberPermissions: &defaultMemberPermissions,
+			Contexts:                 &[]discordgo.InteractionContextType{interactionPrivateChannel},
+		},
 		{
 			Name: "download video",
 			Type: discordgo.MessageApplicationCommand,
@@ -679,6 +685,15 @@ func main() {
 				}
 			}()
 		},
+		"version": func(s *discordgo.Session, i *discordgo.InteractionCreate) {
+			s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+				Type: discordgo.InteractionResponseChannelMessageWithSource,
+				Data: &discordgo.InteractionResponseData{
+					Content: "[yt-dlp-bot](https://git.dubyatp.xyz/williamp/yt-dlp-bot) by dubyatp",
+					Flags:   discordgo.MessageFlagsEphemeral,
+				},
+			})
+		},
 	}
 
 	s.AddHandler(func(s *discordgo.Session, i *discordgo.InteractionCreate) {