Add Mile RTD Provider module documentation

dev-docs/modules/mileRtdProvider.md

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+---
+layout: page_v2
+title: Mile RTD Module
+display_name: Mile RTD Module
+description: The Mile RTD module computes per-slot targeting values through a runtime engine and sets GPT slot targeting used by GAM unified Pricing rules.
+page_type: module
+module_type: rtd
+module_code : mileRtdProvider
+enable_download : true
+vendor_specific: true
+sidebarType : 1
+---
+
+# Mile RTD Provider
+
+## Overview
+
+The `mile` RTD provider computes per-slot targeting values through a runtime engine and sets GPT slot targeting used by GAM unified Pricing rules.
+
+It sets a single targeting key:
+
+- `mile_rtd`
+
+The value is provider-specific and is returned by `window[params.runtimeGlobalName].getMileTargetingByAdUnit(...)`
+
+{% include dev-docs/loads-external-javascript.md %}
+
+## Installation
+
+Build the Mile RTD module into your Prebid.js package with:
+
+```bash
+gulp build --modules=rtdModule,mileRtdProvider,...
+```
+
+## When targeting is applied
+
+Targeting is applied during:
+
+- `onAuctionInitEvent`
+- `onBidResponseEvent`
+
+## Key-value mapping
+
+The runtime engine returns a map keyed by ad unit identifier (slot element ID or ad unit path), and each resolved slot gets:
+
+- key: `mile_rtd`
+- value: `targetingByAdUnit[slotElementId]` or `targetingByAdUnit[adUnitPath]`
+
+Example runtime response:
+
+```js
+{
+  "div-gpt-ad-123": "segA_floorHigh",
+  "/1234567/homepage/top": "segB_floorMid"
+}
+```
+
+Resulting GPT slot targeting:
+
+```js
+slot.setTargeting("mile_rtd", "segA_floorHigh");
+```
+
+## Configuration
+
+Use the RTD module with provider name `mile`:
+
+```js
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [
+      {
+        name: "mile",
+        waitForIt: false,
+        params: {
+          runtimeScriptUrl: "https://cdn.example.com/mile-rtd-runtime.js",
+          runtimeGlobalName: "mileRtdRuntime", // optional, default shown
+        },
+      },
+    ],
+  },
+});
+```
+
+### Params
+
+- `runtimeScriptUrl` (optional): URL of runtime script to load.
+- `runtimeGlobalName` (optional): global object name exposing `getMileTargetingByAdUnit`; defaults to `mileRtdRuntime`.