Added Receive event guides

docs/guides/application-commands/context-menu-commands/receiving-context-menu-command-events.md

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+# Receiving Context Menu events
+
+User commands and Message commands have their own unique objects returned. Different from Slash commands. To get the appropriate object returned, you can use a similar method to the slash commands.
+
+```cs
+client.InteractionCreated += InteractionCreatedHandler;
+
+...
+
+public async Task InteractionCreatedHandler(SocketInteraction arg)
+{
+	if ( arg.Type == InteractionType.ApplicationCommand)
+		Task.Run(() => ApplicationCommandHandler(arg));
+}
+
+public async Task ApplicationCommandHandler(SocketInteraction arg)
+{
+	var slashCommand = arg as SocketSlashCommand;
+	if(slashCommand != null)
+		Console.Writeline("Slash command received!")
+		
+	var userCommand = arg as SocketApplicationUserCommand;
+	if(userCommand != null)
+	{
+		Console.Writeline("User command received!")
+		// userCommand.User = User who ran command.
+		// userCommand.Data.Member = User who was clicked.
+	}
+		
+	var messageCommand = arg as SocketApplicationMessageCommand;
+	if(messageCommand != null)
+	{
+		Console.Writeline("Message command received!")
+		// messageCommand.User = User who ran command.
+		// messageCommand.Data.Message = Message that was clicked.
+	}
+}
+```
+
+User commands return a SocketUser object, showing the user that was clicked to run the command. 
+Message commands return a SocketMessage object, showing the message that was clicked to run the command.
+
+Both return the user who ran the command, the guild (if any), channel, etc.