install fisher if not installed for fish users

installJava.sh

@@ -1,9 +1,14 @@
 # Install SDKMAN
 curl -s "https://get.sdkman.io" | bash
 source "$HOME/.sdkman/bin/sdkman-init.sh"
-# Adding Fish support if fish is installed (assumes that Fisher is already installed)
+
+# Adding Fish support if fish is installed
 if [ -x $HOME/.config/fish ] ; then
+   if [ ! -x $HOME/.config/fisher ] ; then # Install fisher if not installed
+      curl -sL https://git.io/fisher | fish -c 'source && fisher install jorgebucaran/fisher'
+   fi
    fish -c 'fisher install reitzig/sdkman-for-fish'
 fi
+
 # Install Temurin build according with https://whichjdk.com/#adoptium-eclipse-temurin
 sdk install java 17.0.1-tem