Add the GitHub Super-Linter

Add Python flake8 linting for W291 trailing whitespace

.github/linters/.flake8

@@ -0,0 +1,2 @@
+[flake8]
+select = W291

.github/workflows/linter.yml

@@ -0,0 +1,14 @@
+name: Lint Code Base
+
+on: [pull_request]
+
+jobs:
+  build:
+    name: GitHub Super Linter
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: github/super-linter@v4
+        env:
+          VALIDATE_PYTHON_FLAKE8: true
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}