Add Github Actions workflows

.github/workflows/check.yml

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+name: Syntax check
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout the repository
+      uses: actions/checkout@v2
+    - name: Install Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.8'
+    - name: Check all .py files
+      run: python -m compileall royalnet

.github/workflows/publish.yml

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+name: Publish to PyPI
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout the repository
+      uses: actions/checkout@v2
+    - name: Build and publish the package
+      uses: abatilo/actions-poetry@v1.5.0
+      env:
+        POETRY_PYPI_TOKEN_PYPI: ${{ secrets.POETRY_PYPI_TOKEN_PYPI }}
+      with:
+        python_version: 3.8
+        poetry_version: 1.0
+        args: publish --build