Add coinflip slash command

src/main/java/wtf/beatrice/hidekobot/listeners/SlashCommandListener.java

@@ -3,6 +3,7 @@ package wtf.beatrice.hidekobot.listeners;
 import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEvent;
 import net.dv8tion.jda.api.hooks.ListenerAdapter;
 import org.jetbrains.annotations.NotNull;
+import wtf.beatrice.hidekobot.utils.RandomUtil;
 
 public class SlashCommandListener extends ListenerAdapter
 {
@@ -13,6 +14,19 @@ public class SlashCommandListener extends ListenerAdapter
         if (event.getName().equals("ping"))
         {
             event.reply("Pong!").queue();
+        } else if (event.getName().equals("coinflip"))
+        {
+            int rand = RandomUtil.getRandomNumber(0, 1);
+            String msg;
+
+            if(rand == 1)
+            {
+                msg = ":coin: It's **Heads**!";
+            } else {
+                msg = "It's **Tails**! :coin:";
+            }
+
+            event.reply(msg).queue();
         }
 
     }

src/main/java/wtf/beatrice/hidekobot/utils/SlashCommandsUtil.java

@@ -17,6 +17,7 @@ public class SlashCommandsUtil
     static List<CommandData> allCommands = new ArrayList<>()
     {{
         add(Commands.slash("ping", "Test if the bot is responsive."));
+        add(Commands.slash("coinflip", "Flip a coin and get head or tails."));
     }};
 
     public static void updateSlashCommands(JDA jdaInstance)