chore: remove duplicate LICENSE files, link to root (#46)

Author: CalvinAllen

resources/LICENSE

@@ -100,7 +100,8 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="Resources\extension.manifest.json" />
-    <Content Include="Resources\LICENSE">
+    <Content Include="..\..\LICENSE">
+      <Link>Resources\LICENSE</Link>
       <IncludeInVSIX>true</IncludeInVSIX>
     </Content>
     <None Include="source.extension.vsixmanifest">