Add project files.

Common/Common.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Config.Net" Version="5.1.5" />
+  </ItemGroup>
+
+</Project>

Common/Program.cs

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+using Config.Net;
+
+namespace Common
+{
+    public static class Global
+    {
+        public static IConfig config = new ConfigurationBuilder<IConfig>().UseJsonFile("config.json").Build();
+    }
+
+    public interface IConfig
+    {
+        [Option(DefaultValue = VerboseLevel.Normal)]
+        VerboseLevel VerboseLevel { get; }
+
+        [Option(DefaultValue = "mongodb://localhost:27017/crepebh")]
+        string DatabaseUri { get; }
+        
+    }
+
+    public enum VerboseLevel
+    {
+        Normal = 0,
+        Debug = 1
+    }
+}