test vulkan instance creation

README.md

@@ -53,7 +53,9 @@ $ git clone https://git.vxbard.net/homeburger/ouros.git --recursive
 ```
 ### Configure and build project:
 ```bash
-$ cmake -S . -B build -DSDL3_PATH="${SDL3_INSTALL_PATH}" # either set this variable or substitute it in
+$ cmake -S . -B build \
+  -VULKAN_PATH="${VULKAN_INSTALL_PATH}" \ # either set these variables or substitute them in
+  -DSDL3_PATH="${SDL3_INSTALL_PATH}"  # optional, dont need if youre using the sdl in the vulkan sdk
 $ cmake --build build -j
 ```
 ### Execute application: