added readme and refactored NPC to Bot because bot sounds cooler and NPC sounds too much like Citizens and citizens yuck amirite

src/main/java/net/nuggetmc/ai/bot/BotManager.java

@@ -0,0 +1,48 @@
+package net.nuggetmc.ai.bot;
+
+import net.minecraft.server.v1_16_R3.PlayerConnection;
+import net.nuggetmc.ai.PlayerAI;
+import org.bukkit.craftbukkit.v1_16_R3.entity.CraftPlayer;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class BotManager implements Listener {
+
+    private final PlayerAI plugin;
+
+    private final Set<Bot> bots = new HashSet<>();
+
+    public Set<Bot> fetch() {
+        return bots;
+    }
+
+    public void add(Bot bot) {
+        bots.add(bot);
+    }
+
+    public BotManager(PlayerAI plugin) {
+        this.plugin = plugin;
+    }
+
+    public void reset() {
+        for (Bot bot : bots) {
+            bot.despawn();
+        }
+
+        bots.clear();
+    }
+
+    @EventHandler
+    public void onJoin(PlayerJoinEvent event) {
+        PlayerConnection connection = ((CraftPlayer) event.getPlayer()).getHandle().playerConnection;
+
+        for (Bot bot : bots) {
+            bot.render(connection, true);
+        }
+    }
+
+}