docs : Add vLLM Usage : starting-with-vllm

docs/getting-started/quick-start/starting-with-functions.mdx

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 title: "Getting Started with Functions"
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docs/getting-started/quick-start/starting-with-openai-compatible.mdx

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 title: "Starting with OpenAI-Compatible Servers"
 
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docs/getting-started/quick-start/starting-with-vllm.mdx

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+title: "Starting With vLLM"
+---
+
+## Overview
+
+vLLM provides an OpenAI-compatible API, making it easy to connect to Open WebUI. This guide will show you how to connect your vLLM server.
+
+---
+
+## Step 1: Set Up Your vLLM Server
+
+Make sure your vLLM server is running and accessible. The default API base URL is typically:
+
+```
+http://localhost:8000/v1
+```
+
+For remote servers, use the appropriate hostname or IP address.
+
+---
+
+## Step 2: Add the API Connection in Open WebUI
+
+1. Go to ⚙️ **Admin Settings**.
+2. Navigate to **Connections > OpenAI > Manage** (look for the wrench icon).
+3. Click ➕ **Add New Connection**.
+4. Fill in the following:
+   - **API URL**: `http://localhost:8000/v1` (or your vLLM server URL)
+   - **API Key**: Leave empty (vLLM typically doesn't require an API key for local connections)
+5. Click **Save**.
+
+---
+
+## Step 3: Start Using Models
+
+Select any model that's available on your vLLM server from the Model Selector and start chatting.