Merge "[FAB-14522] README update: sdk compatibility"

Author: gennadylaventman

README.md

@@ -24,4 +24,7 @@ The "fabric-chaincode-docker" folder contains instructions to the build
 `hyperledger/fabric-javaenv` docker image.
 
 The "fabric-chaincode-example-gradle" contains an example java chaincode gradle
-project that includes sample chaincode and basic gradle build instructions.
+project that includes sample chaincode and basic gradle build instructions.
+
+# Compatibility
+Java SDK 8 or above