Update vstest integration documentation (#764)

Update vstest integration documentation

Author: MarcoRossignoli

Documentation/VSTestIntegration.md

@@ -1,5 +1,7 @@
 # Coverlet integration with VSTest (a.k.a. Visual Studio Test Platform)
 
+**At the moment collectors integration supports only .NET Core applications and not .NET Framework ones.**
+
 As explained in quick start section to use collectors you need to run *SDK v2.2.401* or newer and your project file must reference `coverlet.collector.dll` and a minimum version of `Microsoft.NET.Test.Sdk`.  
 A sample project file looks like:
 

README.md

@@ -22,7 +22,9 @@ Coverlet can be used through three different *drivers*
 * As a .NET Global tool  
 
 
-### VSTest Integration (preferred due to [known issue](https://github.com/tonerdo/coverlet/blob/master/Documentation/KnownIssues.md#1-vstest-stops-process-execution-earlydotnet-test))
+### VSTest Integration (preferred due to [known issue](https://github.com/tonerdo/coverlet/blob/master/Documentation/KnownIssues.md#1-vstest-stops-process-execution-earlydotnet-test) supports only .NET Core application)
+
+At the moment collectors integration **does not support** .NET Framework application.
 
 ### Installation
 ```bash