added pypi action

.github/workflows/pypi.yaml

@@ -0,0 +1,57 @@
+name: Build and release PyPI
+#Based on the similar action for `gumpy`
+
+#Ensure this only runs when (pre)released
+on:
+  release:
+    types: [released, prereleased]
+
+jobs:
+  build:
+    name: Publish release to PyPi
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - uses: actions/checkout@v2
+
+    - name: Setup timezone
+      uses: zcong1993/setup-timezone@master
+      with:
+        timezone: UTC
+
+    - name: Set up Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install Python dependencies
+      run: |
+        python3 -m pip install --upgrade pip
+        pip3 install .
+
+    - name: Test with pytest
+      run: |
+        pytest --exitfirst --verbose --failed-first \
+        --cov=. --cov-report html
+
+    - name: Install pypa/build
+      run: >-
+        python -m
+        pip install
+        build
+        --user
+        
+    - name: Build a binary wheel and a source tarball
+      run: >-
+        python -m
+        build
+        --sdist
+        --wheel
+        --outdir dist/
+        .
+    - name: Publish a Python distribution to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}