refactor: add player exp methods

include/game/Player.h

@@ -13,7 +13,7 @@ private:
     game::TeamColor m_TeamColor;
 
     std::uint32_t m_Gold = 0;
-    std::int32_t m_EXP = 0;
+    std::uint32_t m_EXP = 0;
     std::string m_Name;
     std::uint8_t m_ID;
 
@@ -33,6 +33,9 @@ public:
     std::uint32_t getGold() const { return m_Gold; }
     void setGold(std::uint32_t gold) { m_Gold = gold; }
 
+    std::uint32_t getEXP() const { return m_EXP; }
+    void setEXP(std::uint32_t exp) { m_EXP = exp; }
+
     std::uint8_t getID() const { return m_ID; }
 };