Add another example to README.md.

README.md

@@ -11,6 +11,7 @@ for linting [Markdown][markdown]/[CommonMark][commonmark] files with
 Glob expression(s) of files to lint (newline-delimited)
 
 The default `*.{md,markdown}` lints all Markdown files in the base directory
+of a project
 
 ## Outputs
 
@@ -18,6 +19,12 @@ The default `*.{md,markdown}` lints all Markdown files in the base directory
 
 ## Examples
 
+To lint Markdown files in the base directory of a project:
+
+```yaml
+- uses: DavidAnson/markdownlint-cli2-action@v1
+```
+
 To lint all Markdown files in a project:
 
 ```yaml