Adding a build test for Windows ARM.

.github/workflows/vs16-arm-ci.yml

@@ -0,0 +1,15 @@
+name: VS16-ARM-CI
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    name: windows-vs16
+    runs-on: windows-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: Use cmake
+        run: |
+          cmake -A ARM64 -DCMAKE_CROSSCOMPILING=1 -DFASTFLOAT_TEST=ON -B build  &&
+          cmake --build build  --verbose