Update Readme to Give Example of the Default Skip 'is' Prefix Behavior

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I'd like to add to the Readme an example of the default configuration for skipping the prefix for functions that start with 'is'. I got stuck on it and it seems like some other folks could benefit from having an example covering the default configuration with and without the prefix.

Maybe something like this:

<script setup>
  const text = useToUpper("it works!");
  const empty = isEmpty(text); // default configuration prefixSkip: ['is']
</script>

<template>
  <div v-if="!empty">{{ text }}</div>
</template>

I'm brand new to contributing to Open Source, so please let me know if I need to put in a PR or if you have any other feedback on this. Maybe this isn't the place to discuss this; if so please let me know. Thanks.