Update README.md

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 You can view the schematic and PCB files using [KiCad](https://www.kicad.org/).   
 To design your own adapters you can follow this [tutorial](https://github.com/sanni/cartreader/wiki/Designing-your-own-Adapters)   
+Also check out the user contributions for even more adapters: https://github.com/sanni/cartreader/discussions/354    
 
-### Also check out the user contributions for even more adapters: https://github.com/sanni/cartreader/discussions/354    
+## All the files in this directory are licensed under the Attribution 4.0 International (CC BY 4.0)     
+
+### This means that you are free to:    
+- Share - copy and redistribute the material in any medium or format    
+- Adapt - remix, transform, and build upon the material for any purpose, even commercially.  
+
+The licensor cannot revoke these freedoms as long as you follow the license terms.    
+
+### Under the following terms:    
+- Attribution - You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.    
+- No additional restrictions - You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.    
+
+More details: https://creativecommons.org/licenses/by/4.0/