Add REHO (#843)

A decision support tool for sustainable urban energy system planning. https://github.com/IPESE/REHO

README.md

@@ -545,7 +545,7 @@ energy system designs and analysis of interactions between technologies.
 - [renewable power plant](https://github.com/Open-Power-System-Data/renewable_power_plants) - Contains scripts to create lists of renewable power plants in Germany, Denmark, France and Poland, and daily time series of cumulated installed capacity per energy source type for Germany.
 - [sup3r](https://github.com/NREL/sup3r) - The Super Resolution for Renewable Resource Data software uses generative adversarial networks to create synthetic high-resolution wind and solar spatiotemporal data from coarse low-resolution inputs.
 - [atlite](https://github.com/PyPSA/atlite) - Light-weight version of Aarhus RE Atlas for converting weather data to power systems data.
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+- [REHO](https://github.com/IPESE/REHO) - A decision support tool for sustainable urban energy system planning.