Add plugin for 'jump'

Considering FASD has been deprecated, jump does the same thing but is
actively maintained!

https://github.com/gsamokovarov/jump

plugins/available/jump.plugin.bash

@@ -0,0 +1,14 @@
+cite about-plugin
+about-plugin 'initialize jump (see https://github.com/gsamokovarov/jump)'
+
+__init_jump() {
+  command -v jump &> /dev/null
+  if [ $? -eq 1 ]; then
+    echo -e "You must install jump before you can use this plugin"
+    echo -e "See: https://github.com/gsamokovarov/jump"
+  else
+    eval "$(jump shell --bind=z)"
+  fi
+}
+
+__init_jump