Update README.md

Author: artemlos

README.md

@@ -6,6 +6,9 @@ This library is continuously being improved. Please contact us at support@crypto
 
 Javadoc can be found here: https://help.cryptolens.io/api/java/
 
+## Adding the library
+There are two pre-compiled jar files: `cryptolens.jar` and `cryptolens-android.jar`. If your application is cross platform or if you would like to have as few dependencies as possible (e.g., without `slf4j`), we recommend to use `cryptolens-android.jar` instead. It contains all the methods except for `GetMachineCode` and `IsOnRightMachine`.
+
 ## Example
 
 ### Key verification