📝 Add user guide `Mobile App` https://github.com/siyuan-note/siy… #101

Job	Run time
Create Release	30s
build (ubuntu-20.04, ../app/kernel-linux/SiYuan-Kernel, -s -w -X github.com/siyuan-note/siyuan/ke...	6m 36s
build (ubuntu-20.04, ../app/kernel-linux/SiYuan-Kernel, -s -w -X github.com/siyuan-note/siyuan/ke...	6m 54s
build (macos-latest, ../app/kernel-darwin/SiYuan-Kernel, -s -w -X github.com/siyuan-note/siyuan/k...	5m 37s
build (macos-latest, ../app/kernel-darwin-arm64/SiYuan-Kernel, -s -w -X github.com/siyuan-note/si...	6m 24s
build (windows-2019, ../app/kernel/SiYuan-Kernel.exe, -s -w -H=windowsgui -X github.com/siyuan-no...	7m 1s
	33m 2s

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