Added new getting started guide

Thanks @MinnDevelopment for his awesome work on
the JDA guide that had no influence here at all.

docs/guides/samples/intro/complete.cs

@@ -0,0 +1,42 @@
+using Discord;
+using Discord.WebSocket;
+using System;
+using System.Threading.Tasks;
+
+namespace MyBot
+{
+	public class Program
+	{
+		public static void Main(string[] args)
+			=> new Program().MainAsync().GetAwaiter().GetResult();
+
+		public async Task MainAsync()
+		{
+			var client = new DiscordSocketClient();
+
+			client.Log += Log;
+			client.MessageReceived += MessageReceived;
+
+			string token = "abcdefg..."; // Remember to keep this private!
+			await client.LoginAsync(TokenType.Bot, token);
+			await client.StartAsync();
+
+			// Block this task until the program is closed.
+			await Task.Delay(-1);
+		}
+
+		private async Task MessageReceived(SocketMessage message)
+		{
+			if (message.Content == "!ping")
+			{
+				await message.Channel.SendMessageAsync("Pong!");
+			}
+		}
+
+		private Task Log(LogMessage msg)
+		{
+			Console.WriteLine(msg.ToString());
+			return Task.CompletedTask;
+		}
+	}
+}