doc: Document fast builds

bazelbuild · Oct 16, 2024 · f361adb · f361adb
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+## Requirements
+In order to get fast build working, you have to add some VM options to the IntelliJ setup.
+You can go to Help -> Edit custom VM options, and add these entries there:
+```
+--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
+--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
+--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
+```