Update README.md

sims/runscripts/README.md

-** ICON simulations**
+**ICON simulations:**
 
-**Baroclinic life cycle simulation with ICON-NWP**
+**1- Baroclinic life cycle simulation with ICON-NWP**
 
 LC1-channel-4000x9000km-2km-0002        : Only with cloud radiaton, two-moment microphysics, and ecrad
 
-**Large eddy model simulations with ICON-LEM**
+**2- Large eddy model simulations with ICON-LEM**
 
 LC1-LES-471x667km-lon40-lat44-300m-0003 : Only with cloud radiaton, two-moment microphysics, ecrad, LATBC: NWP_0002