docs: add contributing #64

Job	Run time
android-cmake-cpu-release	7m 56s
macos-latest-cmake-cpu-debug	7m 40s
android-cmake-cpu-debug	7m 10s
archive-other-files	4s
macos-latest-cmake-cpu-release	10m 28s
macos-latest-cmake-metal-debug	8m 42s
ubuntu-22-cmake-cpu-debug	6m 44s
macos-latest-cmake-metal-release	9m 54s
ubuntu-22-cmake-cpu-release	8m 15s
ubuntu-22-cmake-vulkan-debug	7m 20s
ubuntu-22-cmake-vulkan-release	8m 42s
windows-latest-cmake-cpu-debug	8m 56s
windows-latest-cmake-cpu-release	8m 15s
windows-latest-cmake-vulkan-debug	8m 0s
windows-latest-cmake-vulkan-release	8m 42s
package-addons	33s
	1h 57m 21s

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