Enable auto pypi publish on release (#316)

* Enable auto pypi publish on release

* Update README.md

.github/workflows/release.yaml

@@ -0,0 +1,34 @@
+name: release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    strategy:
+        max-parallel: 6
+
+    steps:
+    - uses: actions/checkout@v2.3.4
+
+    - uses: actions/setup-python@v2.2.2
+      with:
+        python-version: 3.7
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install setuptools setuptools_scm wheel
+
+    - name: Build packages
+      run: python setup.py sdist bdist_wheel
+      working-directory: ./
+
+    - name: Publish package
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        user: __token__
+        password: ${{ secrets.PYPY_API_TOKEN }}
+        packages_dir: ./dist/

README.md

@@ -2,4 +2,4 @@
 
 [![testing](https://github.com/materialsproject/api/workflows/testing/badge.svg)](https://github.com/materialsproject/api/actions?query=workflow%3Atesting) [![codecov](https://codecov.io/gh/materialsproject/api/branch/main/graph/badge.svg)](https://codecov.io/gh/materialsproject/api) [![Language grade: Python](https://img.shields.io/lgtm/grade/python/g/materialsproject/api.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/materialsproject/api/context:python)
 
-This repository is the development environment for the next Materials Project API. A core server implementation and data models will both reside here.
+This repository is the development environment for the next Materials Project API. A core server and client implementation will reside here.