Add FOSSA badge to README

Author: Ickerday

README.md

@@ -2,6 +2,7 @@
 
 [![Build Status](https://github.com/splunk/splunk-sdk-python/actions/workflows/test.yml/badge.svg?branch=master)](https://github.com/splunk/splunk-sdk-python/actions/workflows/test.yml)
 ![License](https://img.shields.io/badge/license-Apache%202.0-informational.svg)
+[![FOSSA Status](https://app.fossa.com/api/projects/custom%2B8617%2Fsplunk%2Fsplunk-sdk-python.svg?type=small)](https://app.fossa.com/projects/custom%2B8617%2Fsplunk%2Fsplunk-sdk-python?ref=badge_small)
 
 The [Splunk Enterprise](https://www.splunk.com/en_us/products/splunk-enterprise.html) Software Development Kit (SDK) for Python is intended to be the primary way for developers to communicate with the Splunk platform's REST API.