Document multi-provider model choices (Tinfoil private + GreenPT green)

getting-started.md

@@ -37,6 +37,9 @@ account. Click it and create your login.
 The chat lives at **[chat.inference.coop](https://chat.inference.coop)**. Log in
 with the account you created in step 1.
 
+- **Choose your model.** You can pick not just *which* model but *where* it runs:
+  **private** (Tinfoil, runs in encrypted enclaves) or **green** (GreenPT, 100%
+  renewable energy). See [API access](api-access.md#models) for the full list.
 - **Web search** is enabled by default (self-hosted, no external dependency).
 - **File uploads** work out of the box — ask the chat about a document you attach.
 - Your usage draws from your monthly allowance; you can see it on the