Added github workflows.

.github/workflows/python-package.yml

@@ -0,0 +1,46 @@
+name: Python package
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest", "macos-latest"]
+        python-version: ["3.8", "3.9", "3.11"]
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        pip install poetry
+        poetry config virtualenvs.create false
+
+        poetry install --with all
+
+    - name: Lint with mypy
+      run: |
+        mypy certified tests
+
+    - name: Test with pytest
+      run: |
+        pytest --cov
+
+    - name: Upload coverage to Codecov
+      if: matrix.python-version == 3.11 && startsWith(matrix.os, 'ubuntu')
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

README.md

@@ -1,3 +1,7 @@
+[![CI](https://github.com/ORNL/certified/actions/workflows/python-package.yml/badge.svg)](https://github.com/ORNL/certified/actions)
+[![Coverage](https://codecov.io/github/ORNL/certified/branch/main/graph/badge.svg)](https://app.codecov.io/gh/ORNL/certified)
+
+
 # Certified
 
 An idiomatic framework for using certificates