Split compilation instructions from README.md (#13457)

doc/compiling/macos.md

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+# Compiling on MacOS
+
+## Requirements
+
+- [Homebrew](https://brew.sh/)
+- [Git](https://git-scm.com/downloads)
+
+Install dependencies with homebrew:
+
+```
+brew install cmake freetype gettext gmp hiredis jpeg jsoncpp leveldb libogg libpng libvorbis luajit zstd
+```
+
+## Download
+
+Download source (this is the URL to the latest of source repository, which might not work at all times) using Git:
+
+```bash
+git clone --depth 1 https://github.com/minetest/minetest.git
+cd minetest
+```
+
+Download Minetest Game (otherwise only the "Development Test" game is available) using Git:
+
+```
+git clone --depth 1 https://github.com/minetest/minetest_game.git games/minetest_game
+```
+
+Download Minetest's fork of Irrlicht:
+
+```
+git clone --depth 1 https://github.com/minetest/irrlicht.git lib/irrlichtmt
+```
+
+## Build
+
+```bash
+mkdir build
+cd build
+
+cmake .. \
+    -DCMAKE_OSX_DEPLOYMENT_TARGET=10.14 \
+    -DCMAKE_FIND_FRAMEWORK=LAST \
+    -DCMAKE_INSTALL_PREFIX=../build/macos/ \
+    -DRUN_IN_PLACE=FALSE -DENABLE_GETTEXT=TRUE
+
+make -j$(sysctl -n hw.logicalcpu)
+make install
+```
+
+## Run
+
+```
+open ./build/macos/minetest.app
+```