add badges to the README

README.md

+[license-badge]: https://img.shields.io/badge/license-MIT-green.svg
+[license-link]: https://opensource.org/licenses/MIT
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+[travis-badge]: https://img.shields.io/travis/stitchEm/stitchEm/master.svg?label=Build
+[travis-link]: https://travis-ci.org/stitchEm/stitchEm
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+[![License][license-badge]][license-link]
+[![Build][travis-badge]][travis-link]
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 Vahana VR & VideoStitch Studio: software to create immersive 360° VR video, live and in post-production.
 
 The software was originally developed by VideoStitch SAS. After the company folded in early 2018, the source code was acquired by the newly founded non-profit organization stitchEm, to publish it under a free software license.