Improve documentation

README.md

@@ -1,16 +1,24 @@
-# arduino/report-size-deltas action
+# `arduino/report-size-deltas` action
+
+[![Tests](https://github.com/arduino/report-size-deltas/workflows/libraries/report-size-deltas%20workflow/badge.svg)](https://github.com/arduino/report-size-deltas/actions?workflow=libraries/report-size-deltas+workflow)
+[![Spell Check](https://github.com/arduino/report-size-deltas/workflows/Spell%20Check/badge.svg)](https://github.com/arduino/report-size-deltas/actions?workflow=Spell+Check)
+[![codecov](https://codecov.io/gh/arduino/report-size-deltas/branch/master/graph/badge.svg)](https://codecov.io/gh/arduino/report-size-deltas)
 
 This action comments on the pull request with a report on the resulting change in memory usage of the [Arduino](https://www.arduino.cc/) sketches compiled by the [`arduino/compile-sketches`](https://github.com/arduino/compile-sketches) action. This should be run from a [scheduled workflow](https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#onschedule).
 
 ## Inputs
 
 ### `size-deltas-reports-artifact-name`
 
-Name of the workflow artifact that contains the memory usage data, as specified to the [`actions/upload-artifact`](https://github.com/actions/upload-artifact) action via its `name` input. Default "size-deltas-reports".
+Name of the [workflow artifact](https://docs.github.com/en/actions/configuring-and-managing-workflows/persisting-workflow-data-using-artifacts) that contains the memory usage data, as specified to the [`actions/upload-artifact`](https://github.com/actions/upload-artifact) action via its `name` input.
+
+**Default**: `"size-deltas-reports"`
 
 ### `github-token`
 
-GitHub access token used to comment the memory usage comparison results to the PR thread. Default [`GITHUB_TOKEN`](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token).
+[GitHub access token](https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token) used to comment the memory usage comparison results to the PR thread.
+
+**Default**: [`GITHUB_TOKEN`](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token)
 
 ## Example usage
 
@@ -22,5 +30,22 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: arduino/report-size-deltas@master
+      - uses: arduino/report-size-deltas@main
+```
+
+This must be used in conjunction with a workflow that runs the [`arduino/compile-sketches`](https://github.com/arduino/compile-sketches) action and uploads the resulting sketches report to a [workflow artifact](https://help.github.com/en/actions/configuring-and-managing-workflows/persisting-workflow-data-using-artifacts):
+```yaml
+on: [push, pull_request]
+jobs:
+  compile:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: arduino/compile-sketches@main
+        with:
+          enable-deltas-report: true
+      - uses: actions/upload-artifact@v2
+        with:
+          name: size-deltas-reports
+          path: size-deltas-reports
 ```