Add license badge and CI status badge

Author: travkin79

README.md

@@ -1,6 +1,12 @@
 ![Flexmark Icon Logo](assets/images/flexmark-icon-logo.png) flexmark-java
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+<!-- see https://shields.io/badges -->
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+![GitHub License](https://img.shields.io/github/license/advantest/flexmark-java)
+[![Java CI with Maven](https://github.com/advantest/flexmark-java/actions/workflows/ci.yml/badge.svg)](https://github.com/advantest/flexmark-java/actions/workflows/ci.yml)
+
+
 **flexmark-java** is a Java implementation of **[CommonMark (spec 0.28)]** parser using the
 blocks first, inlines after Markdown parsing architecture.