Update example in readme

Author: charlieegan3

README.md

@@ -2,3 +2,18 @@
 
 GitHub Action generated to download binaries from GitHub releases and make them
 available for use in later steps.
+
+Example use:
+
+```
+- name: Download binary test
+  uses: charlieegan3/fetch-gh-release-binary@main
+  with:
+    owner: charlieegan3
+    repo: airtable-contacts
+    asset-pattern: Linux_x86_64
+    install-path: /usr/local/bin/airtable-contacts
+    verbose: true
+  env:
+    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```