Add Swagger "badge" to README, currently showing INVALID (FINERACT-1249)

README.md

@@ -1,4 +1,4 @@
-Apache Fineract: A Platform for Microfinance [![Build Status](https://travis-ci.org/apache/fineract.svg?branch=develop)](https://travis-ci.org/apache/fineract) [![Docker Hub](https://img.shields.io/docker/pulls/apache/fineract.svg?logo=Docker)](https://hub.docker.com/r/apache/fineract) [![Docker Build](https://img.shields.io/docker/cloud/build/apache/fineract.svg?logo=Docker)](https://hub.docker.com/r/apache/fineract/builds)
+Apache Fineract: A Platform for Microfinance [![Build Status](https://travis-ci.org/apache/fineract.svg?branch=develop)](https://travis-ci.org/apache/fineract) [![Swagger Validation](https://validator.swagger.io/validator?url=https://demo.fineract.dev/fineract-provider/swagger-ui/fineract.yaml)](https://validator.swagger.io/validator/debug?url=https://demo.fineract.dev/fineract-provider/swagger-ui/fineract.yaml) [![Docker Hub](https://img.shields.io/docker/pulls/apache/fineract.svg?logo=Docker)](https://hub.docker.com/r/apache/fineract) [![Docker Build](https://img.shields.io/docker/cloud/build/apache/fineract.svg?logo=Docker)](https://hub.docker.com/r/apache/fineract/builds)
 ============
 
 Fineract is a mature platform with open APIs that provides a reliable, robust, and affordable core banking solution for financial institutions offering services to the world’s 2 billion underbanked and unbanked.