add playground tab

Author: Michelle Asuamah

fern/docs.yml

@@ -21,6 +21,10 @@ tabs:
     display-name: FAQ
     slug: faq
     href: https://support.assemblyai.com/
+  playground: 
+    display-name: Playground
+    slug: playground
+    href: https://www.assemblyai.com/playground
   changelog:
     display-name: Changelog
     slug: changelog
@@ -281,6 +285,7 @@ navigation:
           # csharp: https://github.com/AssemblyAI/assemblyai-csharp-sdk
           ruby: https://github.com/AssemblyAI/assemblyai-ruby-sdk
   - tab: faq
+  - tab: playground
 colors:
   accent-primary:
     light: "#2545D3"