Add GH action to test on Windows

.gitattributes

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+# To work around MDX issues
+README.md text eol=lf

.github/workflows/workflow.yml

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+name: build-and-test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-windows:
+    strategy:
+      matrix:
+        ocaml-compiler:
+          - ocaml.5.0.0,ocaml-option-mingw
+          - ocaml.5.1.1,ocaml-option-mingw
+
+    runs-on: windows-latest
+
+    env:
+      QCHECK_MSG_INTERVAL: '60'
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Set up OCaml
+        uses: ocaml/setup-ocaml@v2
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          opam-repositories: |
+            dra27: https://github.com/dra27/opam-repository.git#windows-5.0
+            default: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+            standard: https://github.com/ocaml/opam-repository.git
+
+      - name: Install dependencies
+        run: opam install . --deps-only --with-test
+
+      - name: Build
+        run: opam exec -- dune build
+
+      - name: Test
+        run: opam exec -- dune runtest