Update README

Add Apple Clang instructions to README

README.md

@@ -303,7 +303,26 @@ Second command installs the latest version of LLVM (which includes Clang). For o
 The last 5 lines set Clang as CMake compiler in your terminal session and set directory where Boost libraries are located.
 You can also add them to the end of `~/.profile` to set this by default in all sessions.
 
-#### MacOS dependencies installation
+#### macOS dependencies installation
+
+##### Apple Clang
+Install Xcode Command Line Tools if you don't have them. Run:
+```sh
+xcode-select --install
+```
+Follow the prompts to continue.
+
+To install CMake and Boost on macOS we recommend to use [Homebrew](https://brew.sh/) package manager. With Homebrew
+installed, run the following commands:
+```sh
+brew install cmake boost
+```
+After installation, check `cmake --version`. If command is not found, then you need to add to environment path to
+homebrew installed packages. To do this open `~/.zprofile` (for Zsh) or
+`~/.bash_profile` (for Bash) and add to the end of the file the output of `brew shellenv`.
+After that, restart the terminal and check the version of CMake again, now it should be displayed.
+
+Apple Clang is default compiler on macOS, so there's no need in setting environmental variables.
 
 ##### GCC
 Install Xcode Command Line Tools if you don't have them. Run: