add windowExtensionAbility developer's handbook
Signed-off-by: Nac__fancheyu <liuyangyang58@huawei.com>
Change-Id: I0d18c5d5912642dda4d464ea6eb6a468c3adafa7
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Fork自 OpenHarmony / Docs
Signed-off-by: Nac__fancheyu <liuyangyang58@huawei.com>
Change-Id: I0d18c5d5912642dda4d464ea6eb6a468c3adafa7