added playht custom voice guide.

Signed-off-by: Sahil Suman <sahilsuman933@gmail.com>

Author: sahilsuman933

custom-voices/playht.mdx

@@ -0,0 +1,28 @@
+---
+title: "PlayHT"
+description: "Quickstart: Setup PlayHT Custom Voice"
+---
+
+This guide outlines the procedure for integrating your cloned voice with Play.ht through the VAPI platform.
+
+To integrate your cloned voice with [Play.ht](http://play.ht/) using the VAPI platform, follow these steps.
+
+Note that an API subscription is required for this process to work.
+
+1. **Obtain a [Play.ht](http://play.ht/) API Subscription:** Visit the [Play.ht pricing page](https://play.ht/studio/pricing) and subscribe to an API plan.
+2. **Retrieve Your User ID and Secret Key:** Go to the [API Access section](https://play.ht/studio/api-access) on [Play.ht](http://play.ht/) to get your User ID and Secret Key.
+3. **Enter Your API Keys in VAPI:** Navigate to the [VAPI Provider Key section](https://dashboard.vapi.ai/keys) and input your [Play.ht](http://play.ht/) API keys under the [Play.ht](http://play.ht/) section.
+4. **Sync Your Cloned Voice:** From the [Voice Library](https://dashboard.vapi.ai/voice-library) in VAPI, select [Play.ht](http://play.ht/) as your voice provider and click on "Sync with [Play.ht](http://play.ht/)."
+5. **Search and Use Your Cloned Voice:** After syncing, you can search for your cloned voice within the voice library and directly use it with your assistant.
+
+Video Tutorial:
+  <iframe
+    src="https://www.loom.com/embed/45a6e43ae03945a783385f771ea9203d?sid=268071d7-d37f-43aa-843a-13c221af3ed5"
+    title="Loom video player"
+    frameborder="0"
+    allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
+    referrerpolicy="strict-origin-when-cross-origin"
+    width="100%"
+    height="400px"
+    allowfullscreen
+  />

mint.json

@@ -181,6 +181,10 @@
           "group": "Calls",
           "pages": ["call-forwarding", "calls/call-ended-reason"]
         },
+        {
+          "group": "Custom Voices",
+          "pages": ["custom-voices/playht"]
+        },
         {
           "group": "Multilingual Support",
           "pages": ["multilingual"]