Adding Initial API support, updating readme

Geekbot.net/Commands/Say.cs

@@ -0,0 +1,18 @@
+using System.Threading.Tasks;
+using Discord;
+using Discord.Commands;
+
+namespace Geekbot.net.Commands
+{
+    public class Say : ModuleBase
+    {
+        [RequireUserPermission(GuildPermission.Administrator)]
+        [Command("say", RunMode = RunMode.Async)]
+        [Summary("Say Something.")]
+        public async Task Echo([Remainder] [Summary("What?")] string echo)
+        {
+            await Context.Message.DeleteAsync();
+            await ReplyAsync(echo);
+        }
+    }
+}