Create main.yml

Sets up Continuous Integration for building documentation on push.

.github/workflows/main.yml

@@ -0,0 +1,23 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master, documentation ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Sphinx Build
+        uses: ammaraskar/[email protected]
+        with:
+          docs-folder: "docs/"
+