Add basic nuget package properties (#102)

add basic nuget package properties

Author: jtattermusch

kokoro/build_nuget.sh

@@ -31,5 +31,4 @@ export PATH="$PWD/dotnet:$PATH"
 
 mkdir -p artifacts
 
-# TODO(jtattermusch): set the package version in csproj files.
-(cd src/Grpc.AspNetCore.Server && dotnet pack -p:PackageVersion=0.0.1-dev --configuration Release --output ../../artifacts)
+(cd src/Grpc.AspNetCore.Server && dotnet pack --configuration Release --output ../../artifacts)

src/Grpc.AspNetCore.Server/Grpc.AspNetCore.Server.csproj

@@ -1,5 +1,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
+  <PropertyGroup>
+    <Authors>The gRPC Authors</Authors>
+    <Copyright>Copyright 2019 The gRPC Authors</Copyright>
+    <Description>gRPC support for ASP.NET Core</Description>
+    <PackageIconUrl>https://github.com/grpc/grpc.github.io/raw/master/img/grpc_square_reverse_4x.png</PackageIconUrl>
+    <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>
+    <PackageProjectUrl>https://github.com/grpc/grpc-dotnet</PackageProjectUrl>
+    <PackageTags>gRPC RPC HTTP/2 aspnetcore</PackageTags>
+    <VersionPrefix>0.0.1-dev</VersionPrefix>
+  </PropertyGroup>
+
   <PropertyGroup>
     <TargetFramework>netcoreapp3.0</TargetFramework>
     <LangVersion>latest</LangVersion>