Added the release notes MD file and corresponding node entry in the TOC.html file

Author: DeepakRajSundar

wpf-toc.html

@@ -2300,7 +2300,12 @@
 			<li>2025 Volume 3  - v31.*
 				<ul>
 					<li> Weekly Nuget Release 
-						<ul><li><a href="/wpf/release-notes/v31.2.18">v31.2.18</a></li><li><a href="/wpf/release-notes/v31.2.15">v31.2.15</a></li><li><a href="/wpf/release-notes/v31.2.10">v31.2.10</a></li><li><a href="/wpf/release-notes/v31.2.5">v31.2.5</a></li><li><a href="/wpf/release-notes/v31.2.4">v31.2.4</a></li>
+						<ul><li><a href="/wpf/release-notes/v31.2.18">v31.2.18</a></li>
+							<li><a href="/wpf/release-notes/v31.2.16">v31.2.16</a></li>
+							<li><a href="/wpf/release-notes/v31.2.15">v31.2.15</a></li>
+							<li><a href="/wpf/release-notes/v31.2.10">v31.2.10</a></li>
+							<li><a href="/wpf/release-notes/v31.2.5">v31.2.5</a></li>
+							<li><a href="/wpf/release-notes/v31.2.4">v31.2.4</a></li>
 							<li><a href="/wpf/release-notes/v31.2.3">v31.2.3</a></li>
 							<li><a href="/wpf/release-notes/v31.1.23">v31.1.23</a></li>
 							<li><a href="/wpf/release-notes/v31.1.22">v31.1.22</a></li>