Add project files.

TomatenMusicCore/Commands/Checks/OnlyGuildCheck.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using DSharpPlus.SlashCommands;
+using DSharpPlus;
+using TomatenMusic.Music;
+
+namespace TomatenMusic.Commands.Checks
+{
+    public class OnlyGuildCheck : SlashCheckBaseAttribute
+    {
+        public override async Task<bool> ExecuteChecksAsync(InteractionContext ctx)
+        {
+            if (ctx.Guild == null)
+            {
+                await ctx.CreateResponseAsync(InteractionResponseType.ChannelMessageWithSource, new DSharpPlus.Entities.DiscordInteractionResponseBuilder().WithContent("This Command is only available on Guilds.").AsEphemeral(true));
+                return false;
+            }
+
+            return true;
+        }
+    }
+}

TomatenMusicCore/Commands/Checks/UserInMusicChannelCheck.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using DSharpPlus.SlashCommands;
+using DSharpPlus.EventArgs;
+using DSharpPlus;
+using TomatenMusic.Music;
+using Emzi0767.Utilities;
+using Lavalink4NET;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace TomatenMusic.Commands.Checks
+{
+    public class UserInMusicChannelCheck : SlashCheckBaseAttribute
+    {
+        public bool _passIfNull { get; set; }
+        public UserInMusicChannelCheck(bool passIfNull = false)
+        {
+            _passIfNull = passIfNull;
+        }
+        public override async Task<bool> ExecuteChecksAsync(InteractionContext ctx)
+        {
+            IAudioService audioService = TomatenMusicBot.ServiceProvider.GetRequiredService<IAudioService>();
+
+            GuildPlayer player = audioService.GetPlayer<GuildPlayer>(ctx.Guild.Id);
+            bool allowed;
+            //TODO
+            if (player != null)
+            {
+                allowed = ctx.Member.VoiceState.Channel != null && ctx.Member.VoiceState.Channel.Id == player.VoiceChannelId;
+            }
+            else
+                allowed = _passIfNull;
+
+            if (!allowed)
+                await ctx.CreateResponseAsync(InteractionResponseType.ChannelMessageWithSource, new DSharpPlus.Entities.DiscordInteractionResponseBuilder().WithContent("❌ Please connect to the Bots Channel to use this Command").AsEphemeral(true));
+            return allowed;
+        }
+    }
+}

TomatenMusicCore/Commands/Checks/UserInVoiceChannelCheck.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using DSharpPlus.SlashCommands;
+using DSharpPlus;
+using TomatenMusic.Music;
+
+namespace TomatenMusic.Commands.Checks
+{
+    class UserInVoiceChannelCheck : SlashCheckBaseAttribute
+    {
+
+        public override async Task<bool> ExecuteChecksAsync(InteractionContext ctx)
+        {
+
+            if (ctx.Member.VoiceState == null || ctx.Member.VoiceState.Channel == null)
+            {
+                await ctx.CreateResponseAsync(InteractionResponseType.ChannelMessageWithSource, new DSharpPlus.Entities.DiscordInteractionResponseBuilder().WithContent("You are not in a Voice Channel.").AsEphemeral(true));
+                return false;
+            }
+
+            return true;
+            
+        }
+    }
+}