Edit prerequisites and add exercise to root-level config file

Author: kristinaborn

concepts/sets/.meta/config.json

@@ -1,5 +1,5 @@
 {
-  "blurb": "TODO: add blurb for sets concept",
+  "blurb": "Store a collection of unique values",
   "authors": ["kristinaborn"],
   "contributors": []
 }

concepts/sets/about.md

@@ -1,8 +1,8 @@
 # About
 
-In JavaScript, a [set][mdn-sets] is a list-like data structure that can only contain unique primitives and/or object references.
+In JavaScript, a set is a list-like data structure that can only contain unique primitives and/or object references.
 
-Sets must be created using the [set constructor][mdn-set-constructor]; they can be initialized with values by passing an array to the constructor.
+Sets must be created using the set constructor; they can be initialized with values by passing an array to the constructor.
 
 ```javascript
 const emptySet = new Set();
@@ -88,8 +88,6 @@ The short answer is that sets are optimized for searching, and arrays are not. A
 
 In practice, though, this performance difference is negligible unless the collection contains a huge amount of data.
 
-[mdn-sets]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
 [mdn-strict-equality]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Equality_comparisons_and_sameness#strict_equality_using
-[mdn-set-constructor]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/Set
 [mdn-keyed-collections]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Keyed_collections
 [mdn-spread-syntax]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

concepts/sets/links.json

@@ -1 +1,6 @@
-[]
+[
+  {
+    "url": "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set",
+    "description": "MDN: Sets"
+  }
+]

config.json

@@ -163,6 +163,20 @@
         "concepts": ["promises"],
         "prerequisites": ["arrays", "callbacks", "errors", "recursion"],
         "status": "beta"
+      },
+      {
+        "slug": "ozans-playlist",
+        "name": "Ozan's Playlist",
+        "uuid": "",
+        "concepts": ["sets"],
+        "prerequisites": [
+          "array-destructuring",
+          "array-loops",
+          "comparison",
+          "rest-and-spread-operators",
+          "arrays"
+        ],
+        "status": "beta"
       }
     ],
     "practice": [

exercises/concept/ozans-playlist/.meta/design.md

@@ -22,9 +22,11 @@ The Concepts this exercise unlocks are:
 
 ## Prerequisites
 
-- `array-destructuring` because examples use array destructuring and the spread operator
-- `equality` because it is referenced in the introduction and `about.md`
-- `strings` because one task involves splitting a string
+- `array-destructuring` because examples use array destructuring
+- `comparison` because this is where equality is explained
+- `array-loops` because it introduces the for-of loop
+- `rest-and-spread-operators`
+- `arrays`
 
 ## Analyzer