Add missing package metadata

Add missing author, description and tags to the Coinbase provider's package.

Author: martincostello

src/AspNet.Security.OAuth.Coinbase/AspNet.Security.OAuth.Coinbase.csproj

@@ -4,6 +4,12 @@
     <TargetFramework>net5.0</TargetFramework>
   </PropertyGroup>
 
+  <PropertyGroup>
+    <Authors>levimatheri</Authors>
+    <Description>ASP.NET Core security middleware enabling Coinbase authentication.</Description>
+    <PackageTags>aspnetcore;authentication;coinbase;oauth;security</PackageTags>
+  </PropertyGroup>
+
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
     <PackageReference Include="JetBrains.Annotations" PrivateAssets="All" />