[FAB-14961] Update to the FAQ

Change-Id: If44cd4b2807c563989d3b8ad12e058d5a22e54e3
Signed-off-by: Matthew B. White <[email protected]>

Author: mbwhite

FAQ.md

@@ -10,6 +10,9 @@ Install java shim specific prerequisites:
 * Java 8
 * gradle 4.4
 
+Note this is not the most recent version of gradle. An alternative is to use the `gradlew` script within the reposistory. Change each command below to be `./gradlew`
+Installation of Java and gradle can be installed using [sdkman](https://sdkman.io/).
+
 #### Build shim
 
 Clone the fabric shim for java chaincode repo.
@@ -24,6 +27,9 @@ cd fabric-chaincode-java
 gradle clean build install
 ```
 
+Alternatively `classes` can be used instead of `build` to reduce the binaries that are built. This can be sufficient for
+using the local repository.
+
 Build javaenv docker image, to have it locally.
 ```
 gradle buildImage