Add github action (#76)

* Create ci.yml

* Update ci.yml

* Update ci.yml

* Update ci.yml

Author: BichengYing

.github/workflows/ci.yml

@@ -0,0 +1,55 @@
+name: Continuous Integration
+
+on: [push]
+
+jobs:
+  ubuntu-unit-test:
+
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        mpi-vendor: ['openmpi', 'mpich']
+        python-version: [3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install MPI
+      run: ./scripts/install_mpi.sh ${{ matrix.mpi-vendor }}
+    - name: Install BlueFog
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -r requirements.txt
+        git submodule update --init --recursive
+        python -m pip install -e .
+    - name: Unit Test
+      run: make test_torch_basic test_torch_ops
+      
+  macos-unit-test:
+    
+    runs-on: macos-10.15
+    strategy:
+      matrix:
+        mpi-vendor: ['openmpi', 'mpich']
+        python-version: [3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install MPI
+      run: ./scripts/install_mpi.sh ${{ matrix.mpi-vendor }}
+    - name: Install BlueFog
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -r requirements.txt
+        git submodule update --init --recursive
+        python -m pip install -e .
+    - name: Unit Test
+      run: NUM_PROC=2 make test_torch_basic test_torch_ops test_torch_win_ops
+