add sponsoring docs

docs/.vuepress/configs/sidebar.ts

@@ -83,6 +83,7 @@ export const sidebar: Record<string, SidebarConfig> = {
           '/build/sdk/v2/balances.md',
           '/build/sdk/v2/collections.md',
           '/build/sdk/v2/tokens.md',
+          '/build/sdk/v2/sponsoring.md',
         ]
       },
       {

docs/build/sdk/v2/sponsoring.md

@@ -0,0 +1,48 @@
+# Collection sponsoring
+
+In Unique Network, transactions can be sponsored, allowing for a gasless experience where the sponsor covers the transaction fees. This enables seamless and cost-free transfers of NFTs and the execution of smart contracts, even for accounts without native tokens.
+
+[[toc]]
+
+
+## Prerequisite
+
+Follow the [Getting started guide](./quick-start.md) to install required libraries, receive test network OPL tokens, and initialize SDK.
+
+At this point, you need to know how to manage collections. Learn how to do this in the [Working with collections](./collections.md) guide.
+
+You also need to know how to [mint and transfer NFTs](./tokens.md).
+
+## Setting collection sponsoring
+
+The process consists of two steps:
+
+1. Set collection sponsor – only the collection owner or admin can do
+2. Confirm sponsorship. The sponsor should confirm willingness to sponsor collection
+
+```ts:no-line-numbers
+// At this point we assume you already have a minted collection and NFT
+const collectionId = ...
+const tokenId = ...
+
+await sdk.collection.setSponsor({collectionId, sponsor: account.address})
+await sdk.collection.confirmSponsorship({collectionId});
+```
+
+At this point, every action with tokens of this collection, such as transfer or minting, will be sponsored by `account`.
+<!-- 
+TODO
+Let's check that an account without native tokens can perform NFT transfer.
+
+```ts:no-line-numbers
+// generate a new account without OPL
+const emptyAccount = Sr25519Account.fromUri(Sr25519Account.generateMnemonic());
+
+// mint new token to `emptyAccount`
+const {result} = await sdk.token.mintNFTs({collectionId, tokens: [
+ {owner: account.address}
+]});
+
+
+
+``` -->