add badges

Author: lehvolk

README.md

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-[![ci status](https://github.com/UnitTestBot/jacodb/actions/workflows/build-and-test.yml/badge.svg)](https://github.com/UnitTestBot/jacodb/actions/workflows/build-and-test.yml)
 [![Maven](https://maven-badges.herokuapp.com/maven-central/org.jacodb/jacodb-api/badge.svg)](https://central.sonatype.com/search?smo=true&q=org.jacodb)
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 ## Overview
 
 `JacoDB` is a pure Java library that allows you to get information about Java bytecode outside the JVM process and to store it in a database. While Java `Reflection` makes it possible to inspect code at runtime, `JacoDB` does the same for bytecode stored in a file system.