Create README.md

Author: smay1613

README.md

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+Github action for linting the C++ code.
+Uses clang-tidy and cppcheck.
+
+Example of usage:
+```
+name: lint
+
+on: [pull_request]
+jobs:
+  clang-tidy:
+    name: clang-tidy
+    runs-on: ubuntu-latest
+    steps:
+      - name: clang-tidy check
+        uses: smay1613/clang-tidy-action@master
+    env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```