refactor: biome build (#5)

* refactor: rename Biome to BiomeType

* feat: add biome builder

src/gameplay/builders/biome_builder.cpp

@@ -0,0 +1,18 @@
+#include "Cubed/gameplay/builders/biome_builder.hpp"
+
+#include "Cubed/gameplay/chunk.hpp"
+#include "Cubed/gameplay/chunk_generator.hpp"
+namespace Cubed {
+void BiomeBuilder::build_bottom() {
+    ChunkGenerator& chunk_generator = get_chunk_generator();
+    Chunk& chunk = chunk_generator.chunk();
+    auto& m_blocks = chunk.blocks();
+    for (int x = 0; x < CHUCK_SIZE; x++) {
+        for (int y = 0; y < 5; y++) {
+            for (int z = 0; z < CHUCK_SIZE; z++) {
+                m_blocks[Chunk::get_index(x, y, z)] = 3;
+            }
+        }
+    }
+}
+} // namespace Cubed