Move some projects out.

Basic.props

@@ -0,0 +1,36 @@
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Product>Trivial</Product>
+    <Authors>Kingcean Tuan</Authors>
+    <Company>Nanchang Jinchen Software Co., Ltd.</Company>
+    <Version>8.0.0</Version>
+    <AssemblyVersion>8.0.0.0</AssemblyVersion>
+    <FileVersion>8.0.0.0</FileVersion>
+    <Copyright>Copyright (c) 2018 Kingcean Tuan.</Copyright>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <RepositoryUrl>https://github.com/nuscien/trivial</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+    <LangVersion>12.0</LangVersion>
+    <SignAssembly>True</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\Trivial.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'net481' OR '$(TargetFramework)' == 'net48' OR '$(TargetFramework)' == 'net462' OR '$(TargetFramework)' == 'net461'">
+    <DefineConstants>NETOLDVER</DefineConstants>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net481' OR '$(TargetFramework)' == 'net48' OR '$(TargetFramework)' == 'net462' OR '$(TargetFramework)' == 'net461'">
+    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" PrivateAssets="All" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0' OR '$(TargetFramework)' == 'net481' OR '$(TargetFramework)' == 'net48' OR '$(TargetFramework)' == 'net462' OR '$(TargetFramework)' == 'net461'">
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="README.md" Pack="true" PackagePath="README.md" />
+    <None Include="..\LICENSE" Pack="true" PackagePath="LICENSE" />
+  </ItemGroup>
+</Project>