Update to use on M1!

Author: johnno1962

README.md

@@ -11,7 +11,12 @@ separately to build on Linux or macOS using the following commands:
     export JVM_LIBRARY_PATH=$JAVA_HOME/jre/lib/server # macOS
     export JVM_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server # Linux
 
-    ulimit -n 10000 # increase file descriptors for link
+    ulimit -n 10000 # increase file descriptors for link on Linux
+
+    # or, to use the JVM that comes with Xcode
+
+    export JAVA_HOME=/Applications/Xcode.app/Contents/SharedFrameworks/ContentDeliveryServices.framework/Versions/A/itms/java
+    export JVM_LIBRARY_PATH=$JAVA_HOME/lib/server # even works on an M1
 
     swift build -Xlinker -L$JVM_LIBRARY_PATH -Xlinker -rpath -Xlinker $JVM_LIBRARY_PATH -Xlinker -ljvm
 ```