new adapter stellorMediaRtb (#6209)

* new adapter stellorMediaRtb

* update doc

* update doc

---------

Co-authored-by: mderevyanko <mderevyanko24@gmail.com>

Author: quietPusher

dev-docs/bidders/stellorMediaRtb.md

@@ -0,0 +1,37 @@
+---
+layout: bidder
+title: Stellor Media Rtb
+description: Prebid Stellor Media Rtb Adaptor
+biddercode: stellorMediaRtb
+pbjs: true
+pbs: false
+media_types: video, banner
+userIds: all
+fpd_supported: false
+tcfeu_supported: false
+usp_supported: true
+coppa_supported: true
+schain_supported: true
+prebid_member: false
+ortb_blocking_supported: true
+multiformat_supported: will-bid-on-one
+floors_supported: false
+aliasCode: limelightDigital
+sidebarType: 1
+---
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+
+| Name          | Scope    | Description                                                  | Example                  | Type      |
+|:--------------|:---------|:-------------------------------------------------------------|:-------------------------|:----------|
+| `host`        | required | Ad network's RTB host                                        | `'rtb-stellormedia.com'` | `string`  |
+| `adUnitId`    | required | Ad Unit Id will be generated on Stellor Media Rtb Platform.  | `42`                     | `integer` |
+| `adUnitType`  | required | Type of Ad Unit (`'video'`, `'banner'`)                      | `'banner'`               | `string`  |
+| `publisherId` | required | Publisher ID                                                 | `'12345'`                | `string`  |
+| `custom1`     | optional | Custom targeting field 1                                     | `'custom1'`              | `string`  |
+| `custom2`     | optional | Custom targeting field 2                                     | `'custom2'`              | `string`  |
+| `custom3`     | optional | Custom targeting field 3                                     | `'custom3'`              | `string`  |
+| `custom4`     | optional | Custom targeting field 4                                     | `'custom4'`              | `string`  |
+| `custom5`     | optional | Custom targeting field 5                                     | `'custom5'`              | `string`  |