Add : docs for NasmediaAdmixer Adapter

dev-docs/bidders/nasmediaAdmixer.md

@@ -0,0 +1,39 @@
+---
+layout: bidder
+title: Nasmedia Admixer
+description: Prebid Nasmedia Admixer Bidder Adapter
+
+top_nav_section: dev_docs
+nav_section: reference
+hide: true
+
+biddercode: nasmediaAdmixer
+
+biddercode_longer_than_12: true
+prebid_1_0_supported : true
+---
+
+
+#### Send All Bids Ad Server Keys
+
+(Truncated to 20 chars due to [DFP limit](https://support.google.com/dfp_premium/answer/1628457?hl=en#Key-values))
+
+`hb_pb_nasmediaAdmixe`
+`hb_adid_nasmediaAdmi`
+`hb_size_nasmediaAdmi`
+
+### Note:
+
+The Nasmedia Admixer Bidder Adapter requires setup and approval from the Nasmedia Admixer team.  
+Please reach out to <prebid@nasmedia.co.kr> for more information. 
+
+### bid params
+
+{: .table .table-bordered .table-striped }
+
+| Name       | Scope    | Description                                    | Example         |
+| :--------- | :------- | :--------------------------------------------- | :-------------- |
+| `ax_key`   | required | Publisher Key provided by Nasmedia Admixer     |`'ajj7jba3'`     |
+
+---
+