add arduino-lint action

Author: Richard Unger

.github/workflows/ccpp.yml

@@ -1,6 +1,14 @@
 name: Library Compile
-on: push
+on: [push, pull_request]
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: submit
+          project-type: library
   build:
     name: Test compile
     runs-on: ubuntu-latest