chore: Add OpenSSF badge (#3151)

Update README.md

Signed-off-by: schristoff <28318173+schristoff@users.noreply.github.com>

README.md

@@ -4,6 +4,7 @@
 [![porter](https://github.com/getporter/porter/actions/workflows/porter.yml/badge.svg?branch=main&event=push)](https://github.com/getporter/porter/actions/workflows/porter.yml)
 <a href="https://porter.sh/find-issue" alt="Find an issue to work on">
 <img src="https://img.shields.io/github/issues-search?label=%22help%20wanted%22%20issues&query=org%3Agetporter%20label%3A%22good%20first%20issue%22%2C%22help%20wanted%22%20no%3Aassignee" /></a>
+[![OpenSSF Best Practices](https://www.bestpractices.dev/projects/8720/badge)](https://www.bestpractices.dev/projects/8720)
 
 # Porter