Update glossary.yml

Author: Blind4Basics

data/glossary.yml

@@ -244,6 +244,11 @@
 
     It's useful for [debugging - TODO]() too.
 
+- term: Power user
+  description: |
+    Codewars' users gain honor in different ways. Doing so, they progressively unlock some [privilegees](references/gamification/privileges), hence "powers".
+  acronym: PU
+
 - term: Preloaded (code/section)
   description: |
     In a Kata, the preloaded section is code that is executed _before_ the solution of the user is defined. The code hold by this section isn't visible to the user but every function or variable defined there is accessible to him drugint the executions of his code.