MyStylecop

Directory.Build.Props

<Project>
  <PropertyGroup>
    <CodeAnalysisRuleSet>..\MyRuleset.ruleset</CodeAnalysisRuleSet>
  </PropertyGroup>
  <ItemGroup>
    <AdditionalFiles Include="..\stylecop.json" Link="stylecop.json" />
  </ItemGroup>
</Project>

MyRuleset.ruleset

<?xml version="1.0" encoding="utf-8"?>
<RuleSet Name="Global rules" Description="Rules applied to the each csproj" ToolsVersion="15.0">
  <Rules AnalyzerId="Microsoft.Analyzers.ManagedCodeAnalysis" RuleNamespace="Microsoft.Rules.Managed">
    <Rule Id="CA1001" Action="Warning" />
    <Rule Id="CA1009" Action="Warning" />
    <Rule Id="CA1016" Action="Warning" />
    <Rule Id="CA1033" Action="Warning" />
    <Rule Id="CA1049" Action="Warning" />
    <Rule Id="CA1060" Action="Warning" />
    <Rule Id="CA1061" Action="Warning" />
    <Rule Id="CA1063" Action="Warning" />
    <Rule Id="CA1065" Action="Warning" />
    <Rule Id="CA1301" Action="Warning" />
    <Rule Id="CA1400" Action="Warning" />
    <Rule Id="CA1401" Action="Warning" />
    <Rule Id="CA1403" Action="Warning" />
    <Rule Id="CA1404" Action="Warning" />
    <Rule Id="CA1405" Action="Warning" />
    <Rule Id="CA1410" Action="Warning" />
    <Rule Id="CA1415" Action="Warning" />
    <Rule Id="CA1821" Action="Warning" />
    <Rule Id="CA1900" Action="Warning" />
    <Rule Id="CA1901" Action="Warning" />
    <Rule Id="CA2002" Action="Warning" />
    <Rule Id="CA2100" Action="Warning" />
    <Rule Id="CA2101" Action="Warning" />
    <Rule Id="CA2108" Action="Warning" />
    <Rule Id="CA2111" Action="Warning" />
    <Rule Id="CA2112" Action="Warning" />
    <Rule Id="CA2114" Action="Warning" />
    <Rule Id="CA2116" Action="Warning" />
    <Rule Id="CA2117" Action="Warning" />
    <Rule Id="CA2122" Action="Warning" />
    <Rule Id="CA2123" Action="Warning" />
    <Rule Id="CA2124" Action="Warning" />
    <Rule Id="CA2126" Action="Warning" />
    <Rule Id="CA2131" Action="Warning" />
    <Rule Id="CA2132" Action="Warning" />
    <Rule Id="CA2133" Action="Warning" />
    <Rule Id="CA2134" Action="Warning" />
    <Rule Id="CA2137" Action="Warning" />
    <Rule Id="CA2138" Action="Warning" />
    <Rule Id="CA2140" Action="Warning" />
    <Rule Id="CA2141" Action="Warning" />
    <Rule Id="CA2146" Action="Warning" />
    <Rule Id="CA2147" Action="Warning" />
    <Rule Id="CA2149" Action="Warning" />
    <Rule Id="CA2200" Action="Warning" />
    <Rule Id="CA2202" Action="Warning" />
    <Rule Id="CA2207" Action="Warning" />
    <Rule Id="CA2212" Action="Warning" />
    <Rule Id="CA2213" Action="Warning" />
    <Rule Id="CA2214" Action="Warning" />
    <Rule Id="CA2216" Action="Warning" />
    <Rule Id="CA2220" Action="Warning" />
    <Rule Id="CA2229" Action="Warning" />
    <Rule Id="CA2231" Action="Warning" />
    <Rule Id="CA2232" Action="Warning" />
    <Rule Id="CA2235" Action="Warning" />
    <Rule Id="CA2236" Action="Warning" />
    <Rule Id="CA2237" Action="Warning" />
    <Rule Id="CA2238" Action="Warning" />
    <Rule Id="CA2240" Action="Warning" />
    <Rule Id="CA2241" Action="Warning" />
    <Rule Id="CA2242" Action="Warning" />
  </Rules>
  <Rules AnalyzerId="StyleCop.Analyzers" RuleNamespace="StyleCop.Analyzers">
    <Rule Id="SA0001" Action="None" />
    <Rule Id="SA1633" Action="None" />
    <Rule Id="SA1101" Action="Error" />
    <Rule Id="SA1210" Action="Error" />
    <Rule Id="SA1209" Action="Error" />
    <Rule Id="SA1516" Action="Error" />
    <Rule Id="SA1507" Action="Error" />
    <Rule Id="SA1202" Action="Error" />
    <Rule Id="SA1200" Action="Error" />
    <Rule Id="SA1028" Action="Error" />
  </Rules>
  <Rules AnalyzerId="Microsoft.CodeAnalysis.CSharp.Features" RuleNamespace="Microsoft.CodeAnalysis.CSharp.Features">
    <Rule Id="IDE0005" Action="Warning" />
  </Rules>
</RuleSet>

proj.csproj

<?xml version="1.0" encoding="utf-8"?>
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <CodeAnalysisRuleSet>..\MyRuleset.ruleset</CodeAnalysisRuleSet>
    <Nullable>enable</Nullable>
    <WarningsAsErrors>Nullable</WarningsAsErrors>
  </PropertyGroup>
  <ItemGroup>
    <AdditionalFiles Include="..\stylecop.json" Link="stylecop.json" />
  </ItemGroup>
</Project> 

stylecop.json

{
  // ACTION REQUIRED: This file was automatically added to your project, but it
  // will not take effect until additional steps are taken to enable it. See the
  // following page for additional information:
  //
  // https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/EnableConfiguration.md

  "$schema": "https://raw.githubusercontent.com/DotNetAnalyzers/StyleCopAnalyzers/master/StyleCop.Analyzers/StyleCop.Analyzers/Settings/stylecop.schema.json",
  "settings": {
    "documentationRules": {
      "xmlHeader": false,
      "documentPrivateElements": false,
      "documentExposedElements": false,
      "documentInterfaces": false,
      "documentInternalElements": false,
      "documentPrivateFields": false,
      "companyName": "serjKim"
    }
  }
}