Pixad Bidder PR Doc

prebid/Prebid.js#9133

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## 🏷 Type of documentation
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- [X] new bid adapter
- [ ] update bid adapter
- [ ] new feature
- [ ] text edit only (wording, typos)
- [ ] bugfix (code examples)
- [ ] new examples

## 📋 Checklist
<!-- Remove items that don't apply and/or select an item by changing [ ] to [x] -->
- [ ] Related pull requests in prebid.js or server are linked
- [X] For new adapters check [prebid/Prebid.js#9133])

dev-docs/bidders/pixad.md

@@ -0,0 +1,68 @@
+---
+layout: bidder
+title: Pixad
+description: Prebid Pixad Bidder Adapter.
+pbjs: true
+pbs: false
+biddercode: pixad
+media_types: banner,video
+gdpr_supported: false
+usp_supported: false
+coppa_supported: false
+schain_supported: false
+dchain_supported: false
+userIds: criteo, id5Id, sharedId, unifiedId
+safeframes_ok: true
+floors_supported: false
+multiformat_supported: will-bid-on-any
+---
+
+### Description
+
+Pixad header bidding adapter connects with Pixad demand sources to fetch bids for banner network ID. Please reach out to your account manager or <prebid@admatic.com.tr> for more information.
+
+### Bid params
+
+| Name         | Scope    | Description                        | Example    | Type     |
+|--------------|----------|------------------------------------|------------|----------|
+| `networkId` | required | Network ID | `12345` | `number` |
+| `host` | required | RTB Host | `layer.serve.pixad.com.tr` | `string` |
+
+### Test Parameters
+
+300x250 banner test
+```
+var adUnits = [{
+  code: 'your-slot_1-div', //use exactly the same code as your slot div id.
+  sizes: [[300, 250]],
+  bids: [{
+      bidder: 'pixad',
+      params: { 
+          networkId: 12345,
+          host: 'layer.serve.pixad.com.tr'
+      }
+  }]
+},{
+  code: 'your-slot_2-div', //use exactly the same code as your slot div id.
+  sizes: [[600, 800]],
+  bids: [{
+      bidder: 'pixad',
+      params: { 
+          networkId: 12345,
+          host: 'layer.serve.pixad.com.tr'
+      }
+  }]
+}];
+```
+
+## UserSync example
+
+```
+pbjs.setConfig({
+  userSync: {
+    iframeEnabled: true,
+    syncEnabled: true,
+    syncDelay: 1
+  }
+});
+```