Added CI badge to README.

.github/workflows/develop.yml

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-name: MicroHH-CI
+name: ci-test
 
 on:
   push:

README.md

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 MicroHH
 -------
+[![CI Status](https://github.com/bartvstratum/microhh/actions/workflows/develop.yml/badge.svg)
 [![Documentation Status](https://readthedocs.org/projects/microhh/badge/?version=latest)](https://microhh.readthedocs.io/en/latest/?badge=latest)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.13923894.svg)](https://doi.org/10.5281/zenodo.13923894)
 
 MicroHH is a computational fluid dynamics code designed to simulate turbulent flows in the atmosphere using the Direct Numerical Simulation (DNS) and Large-Eddy Simulation (LES) techniques. Its can do idealized flows, but also realistic atmospheric boundary layers with all relevant processes, including moist thermodynamics, radiation, land surface processes, and microphysics. MicroHH is written in C++/CUDA and runs on both CPUs and GPUs using single or double precision floating point numbers.
 
@@ -10,8 +12,6 @@ Visualizations are found in our Vimeo channel: https://vimeo.com/channels/microh
 
 MicroHH is described in detail in [Van Heerwaarden et al. (2017)](https://doi.org/10.5194/gmd-10-3145-2017). In case you decide to use MicroHH for your own research, the developers would appreciate to be notified and kindly request to cite their reference paper. The version described in the reference paper has been assigned a DOI via [Zenodo](https://zenodo.org).
 
-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.13923894.svg)](https://doi.org/10.5281/zenodo.13923894)
-
 
 Requirements
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