chore: add readme to nuget package

Author: FantasticFiasco

Directory.Build.props

@@ -10,6 +10,7 @@
     -->
     <AssemblyVersion>4.0.0.0</AssemblyVersion>
     <Authors>Mattias Kindborg</Authors>
+    <Copyright>Copyright 2019-2022 Mattias Kindborg</Copyright>
     <Company />
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
     <NoWarn>1591;NU5105</NoWarn>

src/AwsSignatureVersion4.csproj

@@ -11,6 +11,7 @@
     <AssemblyOriginatorKeyFile>AwsSignatureVersion4.snk</AssemblyOriginatorKeyFile>
     <!-- NuGet package -->
     <PackageId>AwsSignatureVersion4</PackageId>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageTags>aws;sign;http;request;sigv4;aws-sigv4;aws-signature-v4;aws-signature;aws-signer;aws;amazon-web-services</PackageTags>
     <PackageIcon>aws-signature-version-4.png</PackageIcon>
     <PackageProjectUrl>https://github.com/FantasticFiasco/aws-signature-version-4</PackageProjectUrl>
@@ -26,7 +27,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Include="assets\aws-signature-version-4.png" Pack="true" PackagePath="" />
+    <None Include="assets\aws-signature-version-4.png" Pack="true" PackagePath="\" />
+    <None Include="..\README.md" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
   <!-- SourceLink -->