feat(plays): add character counter play

this play provides a real-time interface for users to track character and word counts using react usestate and regex. it includes reading time estimation and a clear-all feature. fixes #1631

Author: IamAnkit19

src/plays/character-counter/CharacterCounter.css

@@ -32,6 +32,7 @@
   line-height: 1.5;
   outline: none;
   transition: border-color 0.2s;
+  color: black;
 }
 
 .counter-textarea:focus {