Update README.md

README.md

@@ -12,3 +12,5 @@ Suggested citation for the tool EvalAnswer: Kaczmirek, L., Meitinger, K., & Behr
 
 Acknowledgements. 
 This work was supported by two research grants: “Optimierung von Probe-Techniken für interna-tionale Online-Umfragen” [Optimizing probing techniques in international online surveys], (2012-2015, CICOM2, BR 908/5-1) and “Improving intercultural comparative research by the application of cognitive techniques using the Internet in several countries” as part of SPP 1292:  Survey Methodology (2010-2013, CICOM, BR 908/3-1). Principal investigators in both projects were Michael Braun, Wolfgang Bandilla, and Lars Kaczmirek.
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+<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.
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