Your .info file can be found at /sites/all/themes/yourtheme/yourTheme.info.
Just add your files in the below format to your .info file. This assumes that your JS & CSS files are located within /sites/all/themes/yourTheme/js and /sites/all/themes/yourTheme/css respectively.
Adding JS and CSS in Drupal 8
Here is a great post on how to go about adding javacript and style sheet files in Drupal 8:
How to add JS and CSS assets to a Drupal 8 theme
Avid Drupal site builder & user for +10 years.