[Update] add Permission requirements in the README.md
[Update] add Permission requirements in the README.md

lobo12/android-downloader,yungfan/android-downloader,shengge/downloader,hw-beijing/android-downloader,kHRYSTAL/android-downloader,shengge/downloader,wfs3006/android-downloader,kwakuzigah/android-downloader