Formatting license files to match Unity legal standardization (#45)

Fix build after license changes

Author: UnityAlex

Directory.Build.props

@@ -262,11 +262,11 @@
     <Owners>microsoft,dotnetframework</Owners>
     <IncludeSymbols>true</IncludeSymbols>
     <RuntimeIdGraphDefinitionFile>$([MSBuild]::NormalizePath('$(LibrariesProjectRoot)', 'Microsoft.NETCore.Platforms', 'src', 'runtime.json'))</RuntimeIdGraphDefinitionFile>
-    <LicenseFile>$(MSBuildThisFileDirectory)LICENSE.TXT</LicenseFile>
+    <LicenseFile>$(MSBuildThisFileDirectory)LICENSE.md</LicenseFile>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <Copyright>$(CopyrightNetFoundation)</Copyright>
-    <PackageThirdPartyNoticesFile>$(MSBuildThisFileDirectory)THIRD-PARTY-NOTICES.TXT</PackageThirdPartyNoticesFile>
+    <PackageThirdPartyNoticesFile>$(MSBuildThisFileDirectory)Third Party Notices.md</PackageThirdPartyNoticesFile>
     <PackageReleaseNotes>https://go.microsoft.com/fwlink/?LinkID=799421</PackageReleaseNotes>
     <!-- Indicates this is not an officially supported release. Release branches should set this to false. -->
     <!-- Keep it in sync with PRERELEASE in eng/native/configureplatform.cmake -->

LICENSE.TXT renamed to LICENSE.md

@@ -1,4 +1,8 @@
-Microsoft Patent Promise for .NET Libraries and Runtime Components 
+This patent promise is contained in the PATENTS.TXT file of https://github.com/dotnet/runtime and is included here for your reference:
+
+----
+
+Microsoft Patent Promise for .NET Libraries and Runtime Components 
 
 Microsoft Corporation and its affiliates ("Microsoft") promise not to assert 
 any .NET Patents against you for making, using, selling, offering for sale,