Add PYPi action (#87)

.github/workflows/pypi-publish.yml

@@ -0,0 +1,31 @@
+name: "PYPI Publish"
+
+on: 
+  push:
+    tags:
+      - "*"
+
+jobs:
+  docs:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+
+    - name: Install 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 distribution to PyPI
+      if: startsWith(github.ref, 'refs/tags')
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.PYPI }}