Add docs for Google ai/core provider. (#1263)

docs/pages/docs/ai-core/_meta.json

@@ -10,6 +10,7 @@
   "tools": "Tools and Tool Calling",
   "openai": "OpenAI Provider",
   "mistral": "Mistral Provider",
+  "google": "Google Provider",
   "custom-provider": "Custom Providers",
   "generate-text": "generateText API",
   "stream-text": "streamText API",

docs/pages/docs/ai-core/google.mdx

@@ -0,0 +1,48 @@
+---
+title: Google Provider
+---
+
+import { Callout } from 'nextra-theme-docs';
+
+# Google Provider
+
+The Google provider contains language model support for the [Google Generative AI](https://ai.google/discover/generativeai/) APIs.
+It creates language model objects that can be used with the `generateText`, `streamText`, `generateObject`, and `streamObject` AI functions.
+
+## Provider Instance
+
+You can import `Google` from `ai/google` and initialize a provider instance with various settings:
+
+```ts
+import { Google } from 'ai/google';
+
+const google = new Google({
+  baseUrl: '', // optional base URL for proxies etc.
+  apiKey: '', // optional API key, default to env property GOOGLE_GENERATIVE_AI_API_KEY
+});
+```
+
+The AI SDK also provides a shorthand `google` import with a Google provider instance that uses defaults:
+
+```ts
+import { google } from 'ai/google';
+```
+
+## Generative AI Models
+
+You can create models that call the [Google Generative AI API](https://ai.google.dev/api/rest) using the `.generativeAI()` factory method.
+The first argument is the model id, e.g. `models/gemini-pro`.
+The models support tool calls and some have multi-modal capabilities.
+
+```ts
+const model = google.generativeAI('models/gemini-pro');
+```
+
+Google Generative AI models support also some model specific settings that are not part of the [standard call settings](/docs/ai-core/settings).
+You can pass them as an options argument:
+
+```ts
+const model = google.generativeAI('models/gemini-pro', {
+  topK: 0.2,
+});
+```

docs/pages/docs/ai-core/index.mdx

@@ -74,6 +74,7 @@ The AI SDK contains the following providers:
 
 - [OpenAI Provider](/docs/ai-core/openai) (`ai/openai`)
 - [Mistral Provider](/docs/ai-core/mistral) (`ai/mistral`)
+- [Google Provider](/docs/ai-core/google) (`ai/google`)
 
 The AI SDK also provides a [language model specification](https://github.com/vercel/ai/tree/main/packages/core/spec/language-model/v1) that you can use to implement [custom providers](/docs/ai-core/custom-provider).