Add GitHub action for linting

Create main.yml with Ardunio Linter.
https://github.com/arduino/arduino-lint-action#usage

.github/workflows/main.yml

@@ -0,0 +1,10 @@
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: update
+          compliance: strict