Add workflows for cmake build on Mac and Windows.

.github/workflows/cmake-macos.yml

@@ -0,0 +1,19 @@
+name: CMake build on OS X
+on: workflow_dispatch
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup
+      run: |
+        brew install boost
+    - name: Compile
+      env:
+        CXXFLAGS: -O2 -stdlib=libc++ -mmacosx-version-min=10.9
+      run: |
+        cmake .
+        make -j 2
+    - name: Test
+      run: |
+        ./test-suite/quantlib-test-suite --log_level=message

.github/workflows/cmake-win.yml

@@ -0,0 +1,21 @@
+name: CMake build on Windows
+on: workflow_dispatch
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup
+      run: |
+        echo "::set-env name=BOOST_ROOT::$env:BOOST_ROOT_1_72_0"
+        echo "::set-env name=BOOST_INCLUDEDIR::${{ env.BOOST_ROOT }}\boost\include"
+        echo "::set-env name=BOOST_LIBRARYDIR::${{ env.BOOST_ROOT }}\lib"
+    - name: Compile
+      env:
+        CXXFLAGS: -O2
+      run: |
+        cmake .
+        cmake --build . --config Release
+    - name: Test
+      run: |
+        .\test-suite\Release\quantlib-test-suite --log_level=message