Add NOTICE.txt, LICENSE, and license metadata to nuspec

Microsoft.WSLg.nuspec

@@ -12,6 +12,7 @@ Copyright (C) Microsoft Corporation. All rights reserved.
     <owners>Microsoft, WSL Team</owners>
     <projectUrl>https://github.com/microsoft/wslg/</projectUrl>
     <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <license type="expression">MIT</license>
     <description>WSLg support package.</description>
     <summary>Enabling the Windows Subsystem for Linux to include support for Wayland and X server related scenarios.</summary>
     <releaseNotes>ebad9c1</releaseNotes>
@@ -31,5 +32,8 @@ Copyright (C) Microsoft Corporation. All rights reserved.
 
     <file src="package/wslg.rdp" target="build/native/bin/wslg.rdp" />
     <file src="package/wslg_desktop.rdp" target="build/native/bin/wslg_desktop.rdp" />
+
+    <file src="package/NOTICE.txt" target="NOTICE.txt" />
+    <file src="LICENSE" target="LICENSE.txt" />
   </files>
 </package>

cgmanifest.json

@@ -32,13 +32,23 @@
         },        
         {
             "Component": { 
-                "Type": "mesa", 
+                "Type": "git", 
                 "Git": {
                     "RepositoryUrl": "https://github.com/mesa3d/mesa", 
                     "CommitHash": "731ea06758663a2de3a2bd1f12eb8809d4c136fd"
                 }
             },
             "DevelopmentDependency": false
         },
+        {
+            "Component": { 
+                "Type": "git", 
+                "Git": {
+                    "RepositoryUrl": "https://github.com/microsoft/DirectX-Headers", 
+                    "CommitHash": "cf123266ce6f1e9a6e700642edb6356bff1e3d55"
+                }
+            },
+            "DevelopmentDependency": false
+        }
     ]
 }