Add Markdown file previews

ios/project.yml

@@ -7,6 +7,9 @@ packages:
   Highlighter:
     url: https://github.com/smittytone/HighlighterSwift
     from: 3.1.0
+  MarkdownUI:
+    url: https://github.com/gonzalezreal/swift-markdown-ui
+    from: 2.1.0
 targets:
   Gotcha:
     type: application
@@ -35,6 +38,7 @@ targets:
       - Generated/gotcha_core.swift
     dependencies:
       - package: Highlighter
+      - package: MarkdownUI
     preBuildScripts:
       - name: Build Rust core
         basedOnDependencyAnalysis: false