Update README.md

README.md

@@ -1,6 +1,8 @@
 # MUSIC2 - monofonIC
 Modular high-precision IC generator for cosmological simulations. MUSIC2-monofonIC is for non-zoom full box ICs (use [MUSIC](https://bitbucket.org/ohahn/music) for zooms, MUSIC2 for zooms is in the works).
 
+[![CMake on multiple platforms](https://github.com/cosmo-sims/monofonIC/actions/workflows/cmake-multi-platform.yml/badge.svg)](https://github.com/cosmo-sims/monofonIC/actions/workflows/cmake-multi-platform.yml)
+
 Note that this program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY.
 
 BEWARE: This software package is currently in a beta testing phase! Proceed with caution before using it for large-scale simulations.
@@ -107,4 +109,4 @@ specifying the desired number of threads per task in the config file, and the nu
   mpirun -np 16 ./monofonIC <path to config file>
 ```
 
-It will then run with 16 tasks times the number of threads per task specified in the config file.
+It will then run with 16 tasks times the number of threads per task specified in the config file.