Merge pull request finos#111 from finos/add-OpenSSF-badge

Add OpenSSF badge

README.md

@@ -1,4 +1,5 @@
 [![FINOS - Incubating](https://cdn.jsdelivr.net/gh/finos/contrib-toolbox@master/images/badge-incubating.svg)](https://finosfoundation.atlassian.net/wiki/display/FINOS/Incubating)
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/6526/badge)](https://bestpractices.coreinfrastructure.org/projects/6526)
 [<img src="https://img.shields.io/badge/slack-@finos/morphir-green.svg?logo=slack">](https://finos-lf.slack.com/messages/morphir/)
 
 <img src="https://github.com/finos/branding/blob/master/project-logos/active-project-logos/Morphir%20Logo/Horizontal/2020_Morphir_Logo_Horizontal.png?raw=true" width="450">