Add Binder in README.md

Author: casadoj

README.md

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-[![GitHub Pages](https://img.shields.io/badge/GitHub%20Pages-blue.svg)](https://ec-jrc.github.io/lisflood-usecases/) [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/ec-jrc/lisflood-usecases/mekong_usecase?urlpath=%2Fdoc%2Ftree%2Flisflood-notebook.ipynb) ![Python](https://img.shields.io/badge/python-3.8-blue)
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 # Lisflood use cases
 
+[![GitHub Pages](https://img.shields.io/badge/GitHub%20Pages-blue.svg)](https://ec-jrc.github.io/lisflood-usecases/) [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/ec-jrc/lisflood-usecases/mekong_usecase?urlpath=%2Fdoc%2Ftree%2Flisflood-notebook.ipynb) ![Python](https://img.shields.io/badge/python-3.8-blue)
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 This repository hosts two use cases for the LISFLOOD model (v4.3.1). The purpose of those use cases is for you to get kick-started with LISFLOOD as well as to give you the opportunity to verify that the model is running correctly on your PC. For you to be able to do that we have prepared for each of the two use cases all the static input maps, the meteorological forcings and the LISFLOOD setting files. Once you have downloaded and installed the LISFLOOD model on your own PC, we recommend you to download also one (or both) of the use cases and run as a test on your PC. In order for you to know that everything has worked correctly we have uploaded the reference output file. If everything has worked correctly, the time series of discharge values of your output file is identical to the time series of discharge values of the reference file.
 
 The [model documentation](https://ec-jrc.github.io/lisflood-model/) provides a detailed description of the modelling of the hydrological processes; the [user guide](https://ec-jrc.github.io/lisflood-code/) provides the guidelines for the set-up of a simulation.