chore: Add slash command example

Author: queer

src/main/example/slash/JavaExample.java

@@ -0,0 +1,44 @@
+package slash;
+
+import com.mewna.catnip.Catnip;
+import com.mewna.catnip.entity.builder.command.CommandOptionBuilder;
+import com.mewna.catnip.entity.interaction.InteractionResponseType;
+import com.mewna.catnip.entity.interaction.command.ApplicationCommandInteraction;
+import com.mewna.catnip.entity.interaction.command.ApplicationCommandOptionType;
+import com.mewna.catnip.entity.interaction.command.ApplicationCommandType;
+import com.mewna.catnip.entity.message.MessageOptions;
+import com.mewna.catnip.shard.DiscordEvent;
+
+import java.util.List;
+
+public class JavaExample {
+    public static void main(String[] args) {
+        Catnip catnip = Catnip.catnip("your token goes here");
+        
+        catnip.rest().interaction().createGlobalApplicationCommand(
+                ApplicationCommandType.CHAT_INPUT, "test", "my cool command",
+                List.of(
+                        new CommandOptionBuilder()
+                                .name("option")
+                                .description("my cool option")
+                                .type(ApplicationCommandOptionType.STRING)
+                                .required(false)
+                                .build()
+                )
+        ).subscribe();
+        
+        catnip.observable(DiscordEvent.INTERACTION_CREATE).subscribe(interaction -> {
+            if(interaction instanceof ApplicationCommandInteraction command) {
+                if(command.data().name().equals("test")) {
+                    catnip.rest().interaction().createInteractionInitialResponse(
+                            InteractionResponseType.CHANNEL_MESSAGE_WITH_SOURCE,
+                            command.id(), command.token(),
+                            new MessageOptions().content("test response!")
+                    );
+                }
+            }
+        });
+        
+        catnip.connect();
+    }
+}