add github actions

.github/workflows/nos.yml

@@ -0,0 +1,25 @@
+name: gita-test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: [3.6, 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 dependences
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install .
+    - name: Pytest
+      run: |
+          pytest tests --cov=./gita