build: add github actions (#54)

Author: 12rambau

.github/requirements.txt

@@ -0,0 +1,4 @@
+jupyterlab
+ipywidgets>=7.0.0
+pytest
+coverage

.github/workflows/unit.yml

@@ -0,0 +1,30 @@
+name: Build
+
+on: 
+  - push
+  - pull_request
+  - workflow_dispatch
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
+
+    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 dependencies
+        run: pip install -r .github/requirements.txt
+      - name: Test formatting
+        uses: psf/black@stable
+      - name: Setup flake8 annotations
+        uses: rbialon/flake8-annotations@v1
+      - name: test with pytest
+        run: coverage run -m pytest --color=yes tests
+      

.gitignore

@@ -11,3 +11,6 @@ ipyvue/labextension/
 ipyvue/nbextension/
 js/lib
 js/jupyter-vue-*.tgz
+
+# coverage 
+.coverage

README.md

@@ -1,6 +1,7 @@
 [![Version](https://img.shields.io/npm/v/jupyter-vue.svg)](https://www.npmjs.com/package/jupyter-vue)
 [![Version](https://img.shields.io/pypi/v/ipyvue.svg)](https://pypi.python.org/project/ipyvue)
 [![Conda Version](https://img.shields.io/conda/vn/conda-forge/ipyvue.svg)](https://anaconda.org/conda-forge/ipyvue)
+[![black badge](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 
 ipyvue
 ======