add macOS github action and badge to README

.github/workflows/build-macos.yml

@@ -0,0 +1,24 @@
+name: MacOS 15
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: macos-15
+    steps:
+      - name: Set up Homebrew
+        id: set-up-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+      - name: Install wine
+        run: brew install wine-stable
+      - name: Install deps
+        run: brew install portaudio
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+      - name: Build
+        run: make

README.md

@@ -2,6 +2,7 @@ v68
 ===
 
 [![Linux Build](https://github.com/vampirefrog/v68/actions/workflows/build-linux.yml/badge.svg)](https://github.com/vampirefrog/v68/actions/workflows/build-linux.yml)
+[![macOS Build](https://github.com/vampirefrog/v68/actions/workflows/build-macos.yml/badge.svg)](https://github.com/vampirefrog/v68/actions/workflows/build-macos.yml)
 
 A Human68k X68000 CUI emulator. Very similar to [run68](https://github.com/rururutan/run68), it is written from scratch and emulates, besides the OS calls and the CPU, the sound hardware.