Add documentation on Sortable adapter

dev-docs/bidders/sortable.md

@@ -0,0 +1,68 @@
+---
+layout: bidder
+title: Sortable
+description: Prebid Sortable Bidder Adaptor
+top_nav_section: dev_docs
+nav_section: reference
+biddercode: sortable
+biddercode_longer_than_12: false
+hide: true
+prebid_1_0_supported : true
+media_types: banner
+gdpr_supported: true
+---
+
+**Table of Contents**
+
+- [Bid params](#sortable-bid-params)
+- [Banner Ads](#sortable-banner)
+- [Configuration](#sortable-configuration)
+
+<a name="sortable-bid-params" />
+
+### Bid params
+
+{: .table .table-bordered .table-striped }
+| Name | Scope | Description | Example |
+|------+-------+-------------+---------|
+| `tagId` | required | The tag ID from Sortable. | `"test-pb-leaderboard"` |
+| `siteId` | optional | Override the global Sortable site ID, [see here](#sortable-configuration). Please reach out to your Sortable Account Manager for more details. | `"example.com"` |
+| `floor` | optional | The minumum CPM (in USD) requred to participate | `0.25` |
+| `keywords` | optional | Publisher-defined key-value string pairs | `{ "key1": "val1", "key2": "val2" }` |
+
+<a name="sortable-banner" />
+
+### Banner Ads
+
+Sortable supports the banner features described in:
+
+- [The `adUnit` banner documentation]({{site.baseurl}}/dev-docs/adunit-reference.html#adUnit-banner-example)
+- [Getting Started for Developers]({{site.baseurl}}/dev-docs/getting-started.html)
+
+
+<a name="sortable-configuration" />
+
+### Configuration
+
+The Sortable site ID should be set globally in order to improve user sync. How to do so:
+
+```javascript
+pbjs.setConfig({
+   sortable: {
+     siteId: "example.com"
+   }
+});
+ ```
+
+The Sortable adapter has the ability to initiate user-sync requests that will improve DSP user ID match rate,
+with the aim of generating higher bid prices. By default, Sortable sync requests are off. Setting the Sortable site ID globally as described above is required for user-sync requests. 
+
+```javascript
+pbjs.setConfig({
+   userSync: {
+    enabledBidders: ['sortable'],
+    iframeEnabled: true
+ }});
+```
+
+Note: these configs should be combined with any other UserSync config calls, as subsequent calls to setConfig for the same attribute overwrite each other.