title: How do I add custom fields to the categories in Woocommerce?
body: <p>I have a woocommerce site that groups products within categories and displays them on the initial shop page. </p>
  
  <p>I want to add custom fields to the categories. </p>
  
  <p>Theory: On the home page is a search form, the user types in their postcode and the categories with the matching postcode details (which will be specified within the custom fields) are displayed. <br>
  I don't need the custom fields to show on the shop page, I just need to be able to apply the matching postcodes in the backend. </p>
  
  <p>Please does anyone know how I can do this? </p>
  
  <p>I've been working on it for ages and can't seem to find a solution. <br>
  A huge thank you any answers or suggestions in advance. <br>
  P.S: I don't want to use a plugin, just php/html/javascript (&amp; other code) please.</p>