Add support for Xcode

[bijanMC]

Search before asking

• [X] I had searched in the issues and found no similar issues.

Motivation

In CMakeLists.txt, if(CMAKE_GENERATOR STREQUAL "Ninja") is applicable to Xcode as well.

Solution

if(CMAKE_GENERATOR STREQUAL Ninja OR CMAKE_GENERATOR STREQUAL Xcode)

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!

[git-hulk]

@bijanMC Would you like to submit a PR to resolve this?