feat: add category search contract

contracts/v1/game-search-response.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://trixie.reaperofveriod.nl/contracts/v1/game-search-response.json",
+  "title": "Twitch category search response",
+  "type": "array",
+  "maxItems": 25,
+  "items": {
+    "type": "object",
+    "additionalProperties": false,
+    "required": ["id", "name", "box_art_url"],
+    "properties": {
+      "id": { "type": "string", "minLength": 1 },
+      "name": { "type": "string", "minLength": 1 },
+      "box_art_url": { "type": "string", "format": "uri" }
+    }
+  }
+}

fixtures/v1/game-search.response.json

@@ -0,0 +1,7 @@
+[
+  {
+    "id": "123",
+    "name": "Synthetic Game",
+    "box_art_url": "https://static-cdn.jtvnw.net/ttv-boxart/123-52x72.jpg"
+  }
+]