created Engine class

src/Game/GameObjectPool.cpp

@@ -2,6 +2,8 @@
 #include <bit>
 #include <cstring>
 
+namespace ougge {
+
 GameObjectPool::GameObjectPool(u32 size)
 {
     useful_assert(size % 64 == 0, "size of GameObjectPool must be a multiple of 64");
@@ -123,4 +125,6 @@ GameObjectPool::iterator& GameObjectPool::iterator::operator++()
 {
     index = pool->getNearestUsedIndex(index+1);
     return *this;
-}
+}
+
+}