Feature: VkDevice Creation (#5)

* update contributing with goals

* add required extensions to vulkan instance

* add validation layers + debug callback

* add device class which enumerates availble gpu devices

* improve device selection logic

* add logical device creation

CMakeLists.txt

@@ -33,6 +33,7 @@ add_library(maiden_core STATIC
     src/App.cpp
     src/Window.cpp
     src/Engine.cpp
+    src/Device.cpp
     # include extra source files here
 )