scrabble-score: add deep dive information

Author: ErikSchierboom

exercises/scrabble-score/metadata.toml

@@ -2,3 +2,5 @@ title = "Scrabble Score"
 blurb = "Given a word, compute the Scrabble score for that word."
 source = "Inspired by the Extreme Startup game"
 source_url = "https://github.com/rchatley/extreme_startup"
+deep_dive_youtube_id = "pFKLHOygtqQ"
+deep_dive_blurb = "We explore pattern matching, higher-order functions, generator expressions, helper classes and more, looking at languages including F#, Ruby, Rust, AWK and Assembly!"