Update readme file and include into package

Author: nvborisenko

README.md

@@ -1,2 +1,3 @@
-# reportportal-extensions-skippable
-Don't investigate skipped tests in Report Portal
+All .NET agents for Report Portal require investigation of skipped (ignored) tests. This extension sets issue for all skipped tests to `NO_DEFECT` which means that test is no longer required to be investigated.
+
+Install `ReportPortal.Extensions.Skippable` nuget package beside agent is installed (usually to your test project).

src/ReportPortal.Extensions.Skippable/ReportPortal.Extensions.Skippable.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>net45;netstandard2.0</TargetFrameworks>
     <PackageId>ReportPortal.Extensions.Skippable</PackageId>
     <Version>1.0.0</Version>
 
@@ -12,6 +12,7 @@
     <RepositoryType>GitHub</RepositoryType>
     <RepositoryUrl>https://github.com/nvborisenko/reportportal-extensions-skippable</RepositoryUrl>
     <PackageTags>reportportal skipped investigation</PackageTags>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
   <ItemGroup>
@@ -20,6 +21,7 @@
 
   <ItemGroup>
     <None Include="..\..\Logo.png" Pack="true" PackagePath="\" Visible="false" />
+    <None Include="..\..\README.md" Pack="true" PackagePath="\" Visible="false" />
   </ItemGroup>
 
 </Project>