Implement /ready and basic objective mechanics

src/main/java/gg/malloc/defense/engine/PlayerManager.java

@@ -11,6 +11,7 @@ import java.util.Collection;
 
 public class PlayerManager {
   HashMap<Player, State> m_playerStates = new HashMap<>();
+  HashMap<Player, Boolean> m_playerReadyStates = new HashMap<>();
 
   public enum State {
     Idle,
@@ -70,6 +71,34 @@ public class PlayerManager {
   public void addPlayer(Player player) {
     //m_log.info("Adding player " + player); 
     m_playerStates.put(player, State.Idle);
+    m_playerReadyStates.put(player, false);
+  }
+
+  public boolean isReady(Player player) {
+    return m_playerReadyStates.get(player);
+  }
+
+  public void setReady(Player player, boolean ready) {
+    m_playerReadyStates.put(player, ready);
+  }
+
+  public double readyProgress() {
+    int readyNum = 0;
+    for(boolean b : m_playerReadyStates.values()) {
+      if (b) {
+        readyNum += 1;
+      }
+    }
+    return (double)readyNum / (double)m_playerReadyStates.size();
+  }
+
+  public boolean isEveryoneReady() {
+    for(boolean b : m_playerReadyStates.values()) {
+      if (!b) {
+        return false;
+      }
+    }
+    return true;
   }
 
   public boolean removePlayer(Player player) {