Update README.

README.md

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-# nest-desktop-AppImage
-An AppImage of NEST Desktop
+<p>
+  <img src="https://raw.githubusercontent.com/nest-desktop/nest-desktop/v3.0/docs/_static/img/screenshots/start-page.png" />
+</p>
+
+GitHub
+[![commit activity](https://img.shields.io/github/commit-activity/m/nest-desktop/nest-desktop)](https://github.com/nest-desktop/nest-desktop/commits/main)
+[![stars](https://img.shields.io/github/stars/nest-desktop/nest-desktop?style=social)](https://github.com/nest-desktop/nest-desktop/stargazers)
+[![forks](https://img.shields.io/github/forks/nest-desktop/nest-desktop?style=social)](https://github.com/nest-desktop/nest-desktop/network/members)
+
+[![docs](https://img.shields.io/readthedocs/nest-desktop)](https://nest-desktop.readthedocs.io)
+[![license](https://img.shields.io/github/license/nest-desktop/nest-desktop)](https://github.com/nest-desktop/nest-desktop/blob/main/LICENSE)
+[![DOI](https://img.shields.io/badge/DOI-10.1101%2F2021.06.15.444791-blue)](https://doi.org/10.1101/2021.06.15.444791)
+
+---
+
+NEST Desktop is a graphical user interface for [NEST Simulator](https://nest-simulator.org). With this easy-to-use tool, users can interactively construct neuronal networks and explore network dynamics.
+The AppImage is a stand-alone application build with Electron framework.
+
+Advanced users often choose NEST Simulator: a prominent tool for spiking neuronal networks to measure network dynamics.
+However, programming knowledge is required to write code for this tool.
+NEST Desktop bypasses this requirement, but still teaches users how to construct and explore neuronal networks.
+A textual script is generated from the constructed networks and sent to NEST Simulator;
+the network activity is then visualized in a graph or table.
+It is a useful teaching tool, since the network graphs and network activity visualizations can be exported to files that users can implement for their course protocol.
+
+NEST Desktop is available on [EBRAINS](https://ebrains.eu/service/nest-desktop) (free EBRAINS account required).
+
+### Quick start
+
+To get started with NEST Desktop and NEST Simulator, click on an AppImage file downloaded from the release.
+
+> | :information_source: **Info** |
+> | ----------------------------- |
+>
+> NEST Simulator (v3.0 or higher) should be installed and the command (`nest-server`) callable in the terminal. The AppImage starts nest-server before opening the window.
+
+For more information, please see the [User Documentation Page](https://nest-desktop.readthedocs.io).
+
+### Citation
+
+You can use the reference to the preprint for NEST Desktop which is available on [bioRxiv](https://www.biorxiv.org/content/10.1101/2021.06.15.444791v1).
+
+### License [MIT](LICENSE)