Update NuGet specification info and released version 7.0.0

Author: NikolayIT

RtfDomParser.nuspec

@@ -1,12 +1,34 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
-
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
     <Deterministic>false</Deterministic>
+    <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
+    <Title>RTF DOM Parser</Title>
+		<Version>7.0.0</Version>
+    <Authors>Nikolay.IT, yuan yong fu</Authors>
+    <PackageProjectUrl>https://github.com/NikolayIT/RtfDomParser</PackageProjectUrl>
+		<Description>RtfDomParser (a.k.a. DCSoft.RTF and XDesigner.RTF) is an open source C# library for parsing RTF documents and generating RTF DOM Tree.</Description>
+		<PackageReleaseNotes>Original version from yuan yong fu targeting .NET 7.0 with DCSoft.RTF namespaces</PackageReleaseNotes>
+		<PackageTags>RTF, RtfDomParser, DCSoft.RTF, XDesigner.RTF</PackageTags>
+		<PackageReadmeFile>README.md</PackageReadmeFile>
+		<RepositoryUrl>https://github.com/SourceCodeBackup</RepositoryUrl>
+		<RepositoryType>git</RepositoryType>
+		<PackageLicenseFile>LICENSE</PackageLicenseFile>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="..\..\LICENSE">
+      <Pack>True</Pack>
+      <PackagePath>\</PackagePath>
+    </None>
+    <None Include="..\..\README.md">
+      <Pack>True</Pack>
+      <PackagePath>\</PackagePath>
+    </None>
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="System.Drawing.Common" Version="7.0.0" />
     <PackageReference Include="System.Text.Encoding.CodePages" Version="7.0.0" />