Update index.mdx

Added NftProvider object to common structures

src/pages/komodo-defi-framework/api/common_structures/nfts/index.mdx

@@ -197,3 +197,15 @@ The `WithdrawNftData` object is used for withdrawals of NFTs on ERC721 and ERC11
   Due to this difference, the `amount` and `max` fields are only used the when
   the `type` value is `withdraw_erc1155`.
 </Note>
+
+### NftProvider
+
+The `NftProvider` object is used in the 'enable_nft' RPC method. It defines the NFT providers that are avaialable and their configuration.
+
+| Parameter      | Type    | Description                                            |
+| -------------- | ------- | ------------------------------------------------------ |
+| type               | string  | Specifies the type of the provider.                |
+| info               | object  | Additional information about the provider          |
+| info.url           | string  | URL of the provider's endpoint                     |
+| info.proxy_auth    | boolean  | Optional, defaults to false. Indicates whether proxy authentication is enabled for the endpoint |
+