Add readme badges for master branch status and licensing
# Open CAS Framework
+[![Build Status](https://open-cas-logs.s3.us-east-2.amazonaws.com/master-status/build/curr-badge.svg)](https://open-cas-logs.s3.us-east-2.amazonaws.com/master-status/build/build.html)
+[![Tests Status](https://open-cas-logs.s3.us-east-2.amazonaws.com/master-status/tests/curr-badge.svg)](https://open-cas-logs.s3.us-east-2.amazonaws.com/master-status/tests/index.html)
+[![License](https://open-cas-logs.s3.us-east-2.amazonaws.com/master-status/license-badge.svg)](LICENSE)
+
Open CAS Framework (OCF) is high performance block storage caching meta-library
written in C. It's entirely platform and system independent, accessing system API
through user provided environment wrappers layer. OCF tightly integrates with the
