Add new java doc to CrazyLambdas.java

Author: tboychuk

crazy-lambdas/src/main/java/com/bobocode/CrazyLambdas.java

@@ -123,7 +123,12 @@ public static Consumer<Runnable> newThreadRunnableConsumer() {
         throw new UnsupportedOperationException("It's your job to implement this method"); // todo
     }
 
-
+    /**
+     * Returns a {@link Function} that accepts an instance of {@link Runnable} and returns a {@link Supplier} of a
+     * started {@link Thread} that is created from a given {@link Runnable}
+     *
+     * @return a function that transforms runnable into a thread supplier
+     */
     public static Function<Runnable, Supplier<Thread>> runnableToThreadSupplierFunction() {
         throw new UnsupportedOperationException("It's your job to implement this method"); // todo
     }