Generate external contributors

Author: YanaXu

tools/ExternalContributors.md

@@ -1,2 +1,4 @@
 ### Thanks to our community contributors
-* Danny Furnivall (@furnivall), updated checkout (#24634)
+* Math Fortin (@mfortin), Bug fix to allow SharedGalleryImangeId and CommunityGalleryImageId parameters to New-AzVMConfig (#24413)
+* @sakkuntyo, [Get-AzMetric.md]fix: don't worked example 4 (#24653)
+* @Toluwaloope, Update Invoke-AzVMRunCommand.md with more Windows Examples (#23693)