Initial work

DeukBot4/MessageHandlers/Attributes/CommandAttribute.cs

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+using System;
+using DeukBot4.MessageHandlers.Permissions;
+
+namespace DeukBot4.MessageHandlers
+{
+    public class CommandAttribute : Attribute
+    {
+        public string Command { get; }
+        public PermissionLevel Permission { get; }
+
+        public CommandAttribute(string command, PermissionLevel permission)
+        {
+            Command = command;
+            Permission = permission;
+        }
+    }
+}

DeukBot4/MessageHandlers/Attributes/CommandHelpAttribute.cs

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+using System;
+
+namespace DeukBot4.MessageHandlers
+{
+    public class CommandHelpAttribute : Attribute
+    {
+        public string ShortHelp { get; }
+        public string LongHelp { get; }
+
+        public CommandHelpAttribute(string shortHelp, string longHelp)
+        {
+            ShortHelp = shortHelp;
+            LongHelp = longHelp;
+        }
+    }
+}

DeukBot4/MessageHandlers/Attributes/CommandParametersAttribute.cs

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+using System;
+using DeukBot4.MessageHandlers.CommandHandler.RequestStructure;
+
+namespace DeukBot4.MessageHandlers
+{
+    [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
+    public class CommandParametersAttribute : Attribute
+    {
+        public ParameterMatcher.ParameterType[] Types { get; }
+
+        public CommandParametersAttribute(ParameterMatcher.ParameterType[] types)
+        {
+            Types = types;
+        }
+    }
+}