[#105] add BufferType Indirect

include/vkcv/BufferManager.hpp

@@ -13,7 +13,8 @@ namespace vkcv
 		VERTEX,
 		UNIFORM,
 		STORAGE,
-		STAGING
+		STAGING,
+		INDIRECT
 	};
 	
 	enum class BufferMemoryType {

src/vkcv/BufferManager.cpp

@@ -48,6 +48,9 @@ namespace vkcv {
 			case BufferType::INDEX:
 				usageFlags = vk::BufferUsageFlagBits::eIndexBuffer;
 				break;
+            case BufferType::INDIRECT:
+                usageFlags = vk::BufferUsageFlagBits::eStorageBuffer | vk::BufferUsageFlagBits::eIndirectBuffer ;
+                break;
 			default:
 				// TODO: maybe an issue
 				break;