lemma.md (prebid#1455)

* lemma.md

Added lemma md file

* removed extra blank line

* Update lemma.md

change parameter description

Author: lm-abhijit

dev-docs/bidders/lemma.md

@@ -0,0 +1,20 @@
+---
+layout: bidder
+title: LEMMA
+description: Prebid Lemma Bidder Adapter
+hide: true
+biddercode: lemma
+---
+
+### Integration Note:
+
+Lemma bidder adapter requires setup and approval from the Lemma team. Please reach out to your account manager for more information and to start using it.
+
+### Bid params
+
+{: .table .table-bordered .table-striped }
+| Name                | Scope    | Description                           | Example      | Type      |
+| ------------------- | -------- | ------------------------------------- | ------------ | --------- |
+| `pubId`       | required | The publisher ID from Lemma          | `1001`       | `integer` |
+| `adunitId`             | required | Identifier for specific ad adunit  | `1001`       | `integer` |
+| `bidFloor`          | optional | The minimum bid value                 | `1.07`       | `float`   |