Updated 'readme.MD' with details on how to run the app on a physical device without team code-signing permissions.
* Correcting typos.
* Formatting.
* Corrects instructions regarding app group settings.
* Minimum required iOS version.
* App Group name typo. :(
* Forgot formatting.
root README
-Add iOS CI build status
-Organize according to desktop and web/mobile platforms
web/README
- Reorder content to a *Minimum Web Requirements* section
ios/README
- Add some formatting