Update README.md

Author: PiTrem

README.md

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 [demo & step-by-step manual](https://github.com/ComPlat/react-spectra-editor/blob/master/DEMO_MANUAL.md)
 
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+## Acknowledgments
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+This project has been funded by the **[DFG]**.
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+[![DFG Logo]][DFG]
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+Funded by the [Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)](https://www.dfg.de/) under the [National Research Data Infrastructure – NFDI4Chem](https://nfdi4chem.de/) – Projektnummer **441958208** since 2020.
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+[DFG]: https://www.dfg.de/en/
+[DFG Logo]: https://www.dfg.de/zentralablage/bilder/service/logos_corporate_design/logo_negativ_267.png