Add dotnet-versioninfo tool

samples/versioninfo/Program.cs

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+using System;
+using System.IO;
+using System.Reflection;
+using System.Runtime.InteropServices;
+using static System.Console;
+
+namespace versioninfo
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            WriteLine("**.NET Core information");
+            WriteLine($"{nameof(Environment.Version)}: {Environment.Version}");
+            WriteLine($"{nameof(RuntimeInformation.FrameworkDescription)}: {RuntimeInformation.FrameworkDescription}");
+            WriteLine($"Libraries version: {((AssemblyInformationalVersionAttribute[])typeof(object).Assembly.GetCustomAttributes(typeof(AssemblyInformationalVersionAttribute),false))[0].InformationalVersion.Split('+')[0]}");
+            WriteLine($"Libraries hash: {((AssemblyInformationalVersionAttribute[])typeof(object).Assembly.GetCustomAttributes(typeof(AssemblyInformationalVersionAttribute), false))[0].InformationalVersion.Split('+')[1]}");
+            WriteLine();
+            WriteLine("**Environment information");
+            WriteLine($"{nameof(RuntimeInformation.OSDescription)}: {RuntimeInformation.OSDescription}");
+            WriteLine($"{nameof(Environment.OSVersion)}: {Environment.OSVersion}");
+            WriteLine($"{nameof(RuntimeInformation.OSArchitecture)}: {RuntimeInformation.OSArchitecture}");
+            WriteLine($"{nameof(Environment.ProcessorCount)}: {Environment.ProcessorCount}");
+            WriteLine();
+
+            if(RuntimeInformation.OSDescription.StartsWith("Linux") && Directory.Exists("/sys/fs/cgroup"))
+            {
+                WriteLine("**CGroup info**");
+                WriteLine($"cfs_quota_us: {System.IO.File.ReadAllLines("/sys/fs/cgroup/cpu/cpu.cfs_quota_us")[0]}");
+                WriteLine($"memory.limit_in_bytes: {System.IO.File.ReadAllLines("/sys/fs/cgroup/memory/memory.limit_in_bytes")[0]}");
+                WriteLine($"memory.usage_in_bytes: {System.IO.File.ReadAllLines("/sys/fs/cgroup/memory/memory.usage_in_bytes")[0]}");
+
+            }
+        }
+    }
+}

samples/versioninfo/README.md

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+# dotnet-versioninfo tool
+
+Produces information about your .NET, OS and hardware environment. It is also a demonstration of the APIs you can use to get this information for your own uses. This information is likely useful for logging.
+
+## Installation
+
+```console
+dotnet install -g dotnet-versioninfo
+```
+
+[dotnet-versioninfo package](https://www.nuget.org/packages/dotnetsay/)
+
+## Usage
+
+```console
+dotnet-versioninfo
+**.NET Core information
+Version: 3.1.7
+FrameworkDescription: .NET Core 3.1.7
+Libraries version: 3.1.7-servicing.20366.2
+Libraries hash: e8b17841cb5ce923aec48a1b0c12042d445d508f
+
+**Environment information
+OSDescription: Darwin 19.6.0 Darwin Kernel Version 19.6.0: Sun Jul  5 00:43:10 PDT 2020; root:xnu-6153.141.1~9/RELEASE_X86_64
+OSVersion: Unix 19.6.0.0
+OSArchitecture: X64
+ProcessorCount: 8
+```

samples/versioninfo/versioninfo.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <AssemblyName>dotnet-versioninfo</AssemblyName>
+    <Description>Displays .NET version and environment information.</Description>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RollForward>LatestMajor</RollForward>
+    <VersionPrefix>1.0.0</VersionPrefix>
+    <Authors>.NET Team</Authors>
+    <License>MIT</License>
+    <PublishRepositoryUrl>true</PublishRepositoryUrl>
+    <DebugType>embedded</DebugType>
+    <PackAsTool>true</PackAsTool>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(ContinuousIntegrationBuild)'=='true'">
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All"/>
+  </ItemGroup>
+
+</Project>