React Native: Android Sample don't work about gcanvas

[flyskywhy]

@diov fix: TextureView doesn't support displaying a background drawable since Android API 24

Since Alibaba feat: delete weex bridge & reactive bridge, here comes the @flyskywhy/react-native-gcanvas npm package.

After months work, @flyskywhy/react-native-gcanvas runs well on Android and iOS, fix several bugs and add feat: support drawImage() from require('some.png') on Android, iOS and Web described in Changelog.md, refactor with the detailed Example As Usage in README.md.

With Performance Test Result, and Convenient With Browser-like canvas APIs with the easily <canvas/> ported example react-native-particles-bg runs on Android, iOS and Web, @flyskywhy/react-native-gcanvas is the best choice for now 😋