Add Travis and SonarCloud status badges

Author: fsteeg

README.md

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 ![Metafacture](https://raw.github.com/wiki/metafacture/metafacture-core/img/metafacture.png)
 
+[![Build status](https://travis-ci.org/metafacture/metafacture-core.svg?branch=master)](https://travis-ci.org/metafacture/metafacture-core) [![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=org.metafacture:metafacture-core&metric=alert_status)](https://sonarcloud.io/dashboard/index/org.metafacture:metafacture-core)
+
 Metafacture is a toolkit for processing semi-structured data with a focus on library metadata. It provides a versatile set of tools for reading, writing and transforming data. Metafacture can be used as a stand-alone application or as a Java library in other applications. The name Metafacture is a portmanteau of the words *meta* data and manu*facture*.
 
 Metafacture includes a large number of modules for operating on semi-structured data. These modules can be combined to build pipelines to perform complex metadata processing tasks. The pipelines can be constructed either in Java code or with the domain-specific language **Flux**. One of the core features of Metafacture is the **Metamorph** module. Metamorph is an xml-based language for specifying transformations of semi-structured data. It can be seamlessly integrated into Java code.