Add usage examples to README

Author: razor-x

README.md

@@ -74,13 +74,29 @@ $ npm install -D @seamapi/types@latest
 
 ## Usage
 
+### Examples
+
+_These examples assume `SEAM_API_KEY` is set in your environment._
+
+#### List devices
+
 ```ts
 import { SeamHttp } from '@seamapi/http/connect'
 
-const seam = new SeamHttp('your-api-key')
+const seam = new SeamHttp()
 const devices = await seam.devices.list()
 ```
 
+#### Unlock a door
+
+```ts
+import { SeamHttp } from '@seamapi/http/connect'
+
+const seam = new SeamHttp()
+const lock = await seam.locks.get({ name: 'Front Door' })
+await seam.locks.unlockDoor({ device_id: lock.device_id })
+```
+
 ### Authentication Methods
 
 The SDK supports several authentication mechanisms.