chore(readme): add badges for license and forum

README.md

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 # Camunda BPM - The open source BPM platform
 
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.camunda.bpm/camunda-parent/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.camunda.bpm/camunda-parent)
+[![License](https://img.shields.io/github/license/camunda/camunda-bpm-platform?color=blue&logo=apache)](https://github.com/camunda/camunda-bpm-platform/blob/master/LICENSE)
+[![Forum](https://img.shields.io/badge/forum-camunda-green)](https://forum.camunda.org/)
 
 camunda BPM platform is a flexible framework for workflow and process automation. It's core is a native BPMN 2.0 process engine that runs inside the Java Virtual Machine. It can be embedded inside any Java application and any Runtime Container. It integrates with Java EE 6 and is a perfect match for the Spring Framework. On top of the process engine, you can choose from a stack of tools for human workflow management, operations & monitoring.