Added typing

[OoDeLally]

Description

Please include a summary of the change and which issue is fixed if any. Please also include relevant motivation and context (a screenshot is appreciated).

Fixes #

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [X] I've read & comply with the contributing guidelines
• [X] I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• [X] I have made corresponding changes to the documentation (README.md).
• [X] I've checked my modifications for any breaking changes.

[OoDeLally]

Closed in favor of https://github.com/Genymobile/genymotion-device-web-player/pull/88