Add maven central, javadoc and license badges to README.
JIRA: NETCONF-1091
Change-Id: If090ad34aeb103a08e6a01ad8d7ea39f9e94ca9d
Signed-off-by: Matej Sramcik <matej.sramcik@pantheon.tech>
Signed-off-by: Ivan Hrasko <ivan.hrasko@pantheon.tech>
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.opendaylight.netconf/netconf-artifacts/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.opendaylight.netconf/netconf-artifacts)
+[![Javadocs](https://www.javadoc.io/badge/org.opendaylight.netconf/restconf-common.svg)](https://www.javadoc.io/doc/org.opendaylight.netconf/restconf-common)
+[![License](https://img.shields.io/badge/License-EPL%201.0-blue.svg)](https://opensource.org/licenses/EPL-1.0)
+
# OpenDaylight NETCONF/RESTCONF implementation
This project hosts implementations of protocols defined by the [IETF NETCONF Working Group](https://datatracker.ietf.org/wg/netconf/about/).