Medusa System Added

Read about the medusa system [here](https://nadekobot.readthedocs.io/en/latest/medusa/creating-a-medusa/)

src/NadekoBot/Common/Medusa/Adapters/GuildContextAdapter.cs

@@ -0,0 +1,51 @@
+using Microsoft.Extensions.DependencyInjection;
+
+public sealed class GuildContextAdapter : GuildContext
+{
+    private readonly IServiceProvider _services;
+    private readonly ICommandContext _ctx;
+    private readonly Lazy<IEmbedBuilderService> _ebs;
+    private readonly Lazy<IBotStrings> _botStrings;
+    private readonly Lazy<ILocalization> _localization;
+    
+    public override IMedusaStrings Strings { get; }
+    public override IGuild Guild { get; }
+    public override ITextChannel Channel { get; }
+    public override IUserMessage Message
+        => _ctx.Message;
+
+    public override IGuildUser User { get; } 
+
+    public override IEmbedBuilder Embed()
+        => _ebs.Value.Create();
+
+    public GuildContextAdapter(ICommandContext ctx, IMedusaStrings strings, IServiceProvider services)
+    {
+        if (ctx.Guild is not IGuild guild || ctx.Channel is not ITextChannel channel)
+        {
+            throw new ArgumentException("Can't use non-guild context to create GuildContextAdapter", nameof(ctx));
+        }
+
+        Strings = strings;
+        User = (IGuildUser)ctx.User;
+
+        _services = services;
+        _ebs = new(_services.GetRequiredService<IEmbedBuilderService>());
+        _botStrings = new(_services.GetRequiredService<IBotStrings>);
+        _localization = new(_services.GetRequiredService<ILocalization>());
+
+        (_ctx, Guild, Channel) = (ctx, guild, channel);
+    }
+
+    public override string GetText(string key, object[]? args = null)
+    {
+        args ??= Array.Empty<object>();
+        
+        var cultureInfo = _localization.Value.GetCultureInfo(_ctx.Guild.Id);
+        var output = Strings.GetText(key, cultureInfo, args);
+        if (!string.IsNullOrWhiteSpace(output))
+            return output;
+        
+        return _botStrings.Value.GetText(key, cultureInfo, args);
+    }
+}