add entry to active explainers for WebModelContext (#1106)

Author: leotlee

README.md

@@ -94,6 +94,7 @@ we move them into the [Alumni section](#alumni-) below.
 | [JS Self-Profiling API: Conditional Marker Exposure](ConditionalMarkersExposure/explainer.md) | <a href="https://github.com/MicrosoftEdge/MSEdgeExplainers/labels/Conditional%20Marker%20Exposure">![GitHub issues by-label](https://img.shields.io/github/issues/MicrosoftEdge/MSEdgeExplainers/Conditional%20Marker%20Exposure?label=issues)</a> | [New Issue...](https://github.com/MicrosoftEdge/MSEdgeExplainers/issues/new?assignees=heathcliff-msft&labels=Conditional%20Marker%20Exposure&title=%5BConditional+Marker+Exposure%5D+%3CTITLE+HERE%3E) | Performance |
 | [GetSelectionBoundingClientRect()](GetSelectionBoundingClientRect/explainer.md) | <a href="https://github.com/MicrosoftEdge/MSEdgeExplainers/labels/GetSelectionBoundingClientRect">![GitHub issues by-label](https://img.shields.io/github/issues/MicrosoftEdge/MSEdgeExplainers/GetSelectionBoundingClientRect?label=issues)</a> | [New Issue...](https://github.com/MicrosoftEdge/MSEdgeExplainers/issues/new?assignees=anaskim&labels=GetSelectionBoundingClientRect&template=getSelectionBoundingClientRect.md&title=%5BGetSelectionBoundingClientRect%5D+%3CTITLE+HERE%3E) | DOM |
 | [FormControlRange](FormControlRange/explainer.md) | <a href="https://github.com/MicrosoftEdge/MSEdgeExplainers/labels/FormControlRange">![GitHub issues by-label](https://img.shields.io/github/issues/MicrosoftEdge/MSEdgeExplainers/FormControlRange?label=issues)</a> | [New Issue...](https://github.com/MicrosoftEdge/MSEdgeExplainers/issues/new?assignees=t-andresre&labels=FormControlRange&template=form-control-range.md&title=%5BFormControlRange%5D+%3CTITLE+HERE%3E) | DOM |
+| [WebModelContext](WebModelContext/explainer.md) | <a href="https://github.com/MicrosoftEdge/MSEdgeExplainers/labels/WebModelContext">![GitHub issues by-label](https://img.shields.io/github/issues/MicrosoftEdge/MSEdgeExplainers/WebModelContext?label=issues)</a> | [New Issue...](https://github.com/MicrosoftEdge/MSEdgeExplainers/issues/new?assignees=leotlee&labels=WebModelContext&title=%5BWebModelContext%5D+%3CTITLE+HERE%3E) | AI Agents |
 
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