Mention contrib folder in readme, and explain in contrib readme what … #12

	name: NSFPlay contrib build test
	on:
	push:
	branches: [ "master" ]
	pull_request:
	branches: [ "master" ]
	workflow_dispatch:
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build-msys2:
	name: Contrib MSYS2
	runs-on: windows-latest
	steps:
	- name: Checkout Files
	uses: actions/checkout@v4
	- name: Setup MSYS2
	uses: msys2/setup-msys2@v2
	with:
	msystem: UCRT64
	install: make mingw-w64-ucrt-x86_64-gcc mingw-w64-ucrt-x86_64-libiconv
	- name: Build
	shell: msys2 {0}
	run: make -C contrib -j

	build-contrib-ubuntu:
	name: Contrib Ubuntu
	runs-on: ubuntu-latest
	steps:
	- name: Checkout Files
	uses: actions/checkout@v4
	- name: Build
	run: make -C contrib -j

	build-contrib-macos:
	name: Contrib macOS
	runs-on: macos-latest
	steps:
	- name: Checkout Files
	uses: actions/checkout@v4
	- name: Build
	run: make -C contrib -j

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