Add CI on github action. (#76)

.github/workflows/continuous-integration.yaml

+name: Build and run tests
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  build:
+    name: ${{ matrix.config.name }}
+    runs-on: ${{ matrix.config.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - name: "Windows Latest - MSVC"
+            os: windows-latest
+            cc: "cl"
+            cxx: "cl"
+            cmake: cmake
+            test: false
+
+          - name: "Ubuntu Latest - GCC"
+            os: ubuntu-latest
+            cc: "gcc-9"
+            cxx: "g++-9"
+            cmake: "cmake"
+            test: true
+
+          - name: "Ubuntu Latest - Clang"
+            os: ubuntu-latest
+            cc: "clang-9"
+            cxx: "clang++-9"
+            cmake: "cmake"
+            test: true
+
+          - name: "Ubuntu Latest - Emscripten"
+            os: ubuntu-latest
+            cc: "emcc"
+            cxx: "em++"
+            cmake: "emcmake cmake"
+            test: false 
+
+          - name: "macOS Latest Clang"
+            os: macos-latest
+            artifact: "macos_clang.7z"
+            build_type: "Release"
+            cc: "clang"
+            cxx: "clang++"
+            cmake: cmake
+            test: true
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: seanmiddleditch/gha-setup-ninja@master
+
+      - name: Set Windows ENV
+        if: runner.os == 'Windows'
+        uses: ilammy/msvc-dev-cmd@v1
+
+      - name: Setup Emscripten
+        if: ${{ matrix.config.cc  == 'emcc' }}
+        uses: mymindstorm/setup-emsdk@v7
+
+      - name: Build
+        run: >
+          mkdir build;
+          cd build;
+          ${{ matrix.config.cmake }}
+          ..
+          -DCMAKE_CXX_COMPILER=${{ matrix.config.cxx }}
+          -DFTXUI_BUILD_TESTS=ON;
+          cmake --build . --config Release;
+
+      - name: Tests
+        if: ${{ matrix.config.test }}
+        run: >
+          cd build;
+          ./tests

src/ftxui/component/screen_interactive.cpp

@@ -92,6 +92,8 @@ void EventListener(std::atomic<bool>* quit,
 
 #else
 
+#include <sys/time.h>
+
 int CheckStdinReady(int usec_timeout) {
   timeval tv = {0, usec_timeout};
   fd_set fds;