Enable installation on Apple M1

Add readme content to ensure c++ 11 compilation on mac

README.md

@@ -11,6 +11,19 @@ The user can provide `face_data` which then projected onto the `face_img`.
 We support automatic face detection with landmark extraction using `mediapipe`.
 However, the user can also provide the landmarks manually if they are already known and fit the Canonical Face Model.
 
+## Installation
+
+### MacOS
+
+To use meshpy a C++ compiler is required.
+On MacOS you can use xcodebuild which is installed by default.
+To enable it please run the following command and agree to the license agreement.
+Then it should be able to compile the C++ code in your python environment.
+
+```bash
+sudo xcodebuild -license
+```
+
 ## Usage
 
 ```python

setup.cfg

@@ -51,7 +51,8 @@ install_requires =
     numpy
     meshpy
     opencv-python-headless
-    mediapipe
+    mediapipe; platform_system != "Darwin" or platform.machine != "arm64"
+    mediapipe-silicon; platform_system == "Darwin" and platform.machine == "arm64"
 
 [options.packages.find]
 where = src