Add 1accord Bidder docs (#5506)

* 1Accord bidder added

* line fix

* first party data details added

* blank line fix

* gvl_id fix

---------

Co-authored-by: Gabriel Chicoye <[email protected]>

dev-docs/bidders/1accord.md

@@ -0,0 +1,121 @@
+---
+layout: bidder
+title: 1accord
+description: Prebid 1accord Bidder Adapter
+pbjs: true
+biddercode: 1accord
+aliasCode : nexx360
+gvl_id: 965 (nexx360)
+tcfeu_supported: true
+usp_supported: true
+gpp_supported: true
+schain_supported: true
+dchain_supported: false
+floors_supported: true
+userIds: all
+tcf2_supported: true
+media_types: banner, video, native
+safeframes_ok: true
+deals_supported: true
+sidebarType: 1
+fpd_supported: true
+
+---
+
+### Bid Params
+
+{: .table .table-bordered .table-striped }
+| Name          | Scope    | Description                | Example                                   | Type      |
+|---------------|----------|----------------------------|--------------------------------------     |-----------|
+| `tagId`       | required | tag ID                     | `"testnexx"`                              | `string`  |
+
+### First Party Data
+
+Publishers should use the `ortb2` method of setting [First Party Data](https://docs.prebid.org/features/firstPartyData.html).
+The following fields are supported:
+
+* ortb2.site.ext.data.*
+* ortb2.site.content.data[]
+* ortb2.user.ext.data.*
+* ortb2.user.data[]
+
+### Test Parameters
+
+```javascript
+var adUnits = [
+   // Banner adUnit
+   {
+      code: 'banner-div',
+      mediaTypes: {
+        banner: {
+          sizes: [[300, 250], [300,600]]
+        }
+      },
+      bids: [{
+         bidder: '1accord',
+         params: {
+            tagId: 'testnexx'
+         }
+       }]
+   },
+   // Video adUnit
+   {
+        code: 'video1',
+        mediaTypes: {
+            video: {
+                playerSize: [640, 480],
+                context: 'instream'
+            }
+        },
+        bids: [{
+            bidder: '1accord',
+            params: {
+               tagId: 'testnexx'
+            }
+        }]
+    },
+     // Native adUnit
+   {
+        code: 'native1',
+        mediaTypes:
+            native: {
+                title: {
+                    required: true
+                },
+                image: {
+                    required: true
+                },
+                sponsoredBy: {
+                    required: true
+                }
+            }
+        },
+        bids: [{
+            bidder: '1accord',
+            params: {
+               tagId: 'testnexx'
+            }
+        }]
+    },
+    // Multiformat Ad
+   {
+        code: 'multi1',
+        mediaTypes: {
+            video: {
+                playerSize: [640, 480],
+                context: 'instream'
+            },
+            banner: {
+              sizes: [[300, 250], [300,600]]
+            }
+        },
+        bids: [{
+            bidder: '1accord',
+            params: {
+               tagId: 'testnexx',
+               videoTagId: 'testnexx'
+            }
+        }]
+    };
+];
+```