Add Jenkins build and Maven central badges
~ limitations under the License.
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+[![Build Status](https://builds.apache.org/job/unomi-master/badge/icon)](https://builds.apache.org/job/unomi-master/)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.apache.unomi/unomi-root/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.apache.unomi/unomi-root)
+
+
Apache Unomi
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