Added CII Best Practices Badge

Signed-off-by: Flurb <[email protected]>

Author: Flurb

README.md

@@ -1,5 +1,7 @@
 # CoMPAS - (Co)nfiguration (M)odules for (P)ower industry (A)utomation (S)ystems
 
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/5925/badge)](https://bestpractices.coreinfrastructure.org/projects/5925)
+
 ## Mission
 
 For the mission go to [CoMPAS Mission](https://com-pas.github.io/contributing/MISSION-COMPAS.html).