Actions added.

.github/workflows/ubuntu18.yml

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+name: Ubuntu 18.04 CI (GCC 7)
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup cmake
+        uses: jwlawson/actions-setup-cmake@v1.0
+        with:
+          cmake-version: '3.9.x'
+      - name: Use cmake
+        run: |
+          mkdir build &&
+          cd build &&
+          cmake  -DFASTFLOAT_TEST=ON  .. &&
+          cmake --build . &&
+          ctest --output-on-failure -R basictest

.github/workflows/ubuntu20.yml

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+name: Ubuntu 20.04 CI (GCC 9)
+
+on: [push, pull_request]
+
+jobs:
+  ubuntu-build:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup cmake
+        uses: jwlawson/actions-setup-cmake@v1.0
+        with:
+          cmake-version: '3.9.x'
+      - name: Use cmake
+        run: |
+          mkdir build &&
+          cd build &&
+          cmake  -DFASTFLOAT_TEST=ON  .. &&
+          cmake  --build .   &&
+          ctest --output-on-failure  -R basictest

.github/workflows/vs16-ci.yml

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+name: VS16-CI
+
+on: [push, pull_request]
+
+jobs:
+  ci:
+    name: windows-vs16
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: 'Run CMake with VS16'
+      uses: lukka/run-cmake@v2
+      with:
+        cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
+        cmakeListsTxtPath: '${{ github.workspace }}/CMakeLists.txt'
+        buildDirectory: "${{ github.workspace }}/../../_temp/windows"
+        cmakeBuildType: Release
+        buildWithCMake: true
+        cmakeGenerator: VS16Win64
+        cmakeAppendedArgs: -DFASTFLOAT_TEST=ON
+        buildWithCMakeArgs:  --config Release  
+
+    - name: 'Run CTest'
+      run: ctest -C Release    --output-on-failure  -R basictest
+      working-directory: "${{ github.workspace }}/../../_temp/windows"