add build system, vendor deps, init stuff

src/platform/platform.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+struct PlatformWindow;
+
+struct PlatformWindowDesc {
+    const char *title = "autosample";
+    int32_t width     = 1280;
+    int32_t height    = 720;
+};
+
+PlatformWindow *platform_create_window(PlatformWindowDesc *desc);
+void            platform_destroy_window(PlatformWindow *window);
+bool            platform_poll_events(PlatformWindow *window);
+void            platform_get_size(PlatformWindow *window, int32_t *w, int32_t *h);
+void           *platform_get_native_handle(PlatformWindow *window);