How do I add icons to taxonomy terms? I have a sample site running Drupal 8.1.x, I want to add icons to the taxonomy term. 

Example.

I have a term called Animals with the following list in it

Cats
Dogs
Fish

i want to assign an icon for each terms, a picture of a cat for Cats and so on and will be using it as exposed filter. So i want the pictures/icons instead of the the words Cats - Dogs - Fish.

I have looked into template_preprocess_field(&amp;$variables, $hook). I dont know how to go about it, also tried assigning an image filed for each term but the pictures are not showing up on the exposed filter menu.

Please help.
You can add image field in taxonomy.You can find option like this.

Then add image field instant of title.