Update LICENSE

Author: ElenaGorbatkova

LICENSE

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-https://creativecommons.org/licenses/by-nc/3.0/
+This demo illustrates a basic backend integration setup between a sample React application that integrates the SurveyJS Survey Creator and Form Library components, and an ASP.NET server.
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+Please note that the Survey Creator component is proprietary software and requires a developer licence to be integrated and used in your own application.
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+For full details, please refer to the SurveyJS Licensing FAQ at https://surveyjs.io/faq#licensing) and the SurveyJS End-User Licence Agreement (EULA) https://surveyjs.io/Developer-License-Agreement.pdf.