Add MacOS

Author: ThomasFarstrike

docs/os-development/compile-and-run.md

@@ -44,7 +44,7 @@
     - lvgl_micropython/build/lvgl_micropy_macOS
     - lvgl_micropython/build/lvgl_micropy_ESP32_GENERIC_S3-SPIRAM_OCT-16.bin
 
-## Running on Desktop
+## Running on Linux or MacOS
 
 1. Download a release binary (e.g., `MicroPythonOS_amd64_Linux`, `MicroPythonOS_amd64_MacOS`) or build your own [on MacOS](macos.md) or [Linux](linux.md).
 2. Run the application:

docs/os-development/macos.md

@@ -0,0 +1,25 @@
+# OS Development on MacOS
+
+Most users can just use a pre-built binary from the [releases page](https://github.com/MicroPythonOS/MicroPythonOS/releases) and install it manually or using the [web installer](https://install.MicroPythonOS.com).
+
+But if for some reason that one doesn't work, or you really want to modify things under the hood, you're in the right place here!
+
+## Get the prerequisites
+
+Clone the repositories:
+
+```
+git clone --recurse-submodules https://github.com/MicroPythonOS/MicroPythonOS.git
+```
+
+That will take a while, because it recursively clones MicroPython, LVGL, ESP-IDF and all their dependencies.
+
+While that's going on, make sure you have everything installed to compile code:
+
+```
+xcode-select --install || true # already installed on github
+brew install pkg-config libffi ninja make SDL2
+```
+
+
+{!os-development/compile-and-run.md!}