docs: add collection offer example (#1434)

* docs: add collection offer example

* Update getting-started.md

* lint

developerDocs/getting-started.md

@@ -97,7 +97,22 @@ See [Listening to Events](#listening-to-events) to respond to the setup transact
 
 ### Creating Collection and Trait Offers
 
-Criteria offers, consisting of collection and trait offers, are supported with `openseaSDK.createCollectionOffer()`. For trait offers, include `traitType` as the trait name and `traitValue` as the required value for the offer.
+Criteria offers, consisting of collection and trait offers, are supported with `openseaSDK.createCollectionOffer()`.
+
+For trait offers, include `traitType` as the trait name and `traitValue` as the required value for the offer.
+
+```typescript
+const collection = await sdk.api.getCollection("cool-cats-nft");
+const offer = await openseaSDK.createCollectionOffer({
+  collectionSlug: collection.collection,
+  accountAddress: walletAddress,
+  paymentTokenAddress: getWETHAddress(sdk.chain),
+  amount: 7,
+  quantity: 1,
+  traitType: "face",
+  traitValue: "tvface bobross",
+});
+```
 
 #### Creating English Auctions