README.md simplified and created user_manual.md to keep list of current implemented features.
Put icons in correspondent group (Images) to stay consistent.
Added sdk-objectivec-apple submodule that had been removed for some reasons.
Removed git submodule because it is not recognized in Xcode.
Submodule trobbleshooting

Removed submodule folders.
Added submodule at the wrong place then deleted.
Deleted sdk-objectivec folder
Added again submodule.
removed modules
added sdk submodule
Submodule cleaned.
Link with framework PryvApiKit
Set Base SDK to 10.6
Refactor in sdk-objectivec