Add project files.

MyOffice.Shared/Configuration.cs

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+namespace MyOffice.Shared;
+
+using Microsoft.Extensions.Configuration;
+
+public static class SharedConfiguration
+{
+	public static IConfiguration ConfigurationContainer { get; private set; }
+
+	public static IConfiguration CreateConfigurationContainer()
+	{
+		try
+		{
+			var environment = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
+			if (string.IsNullOrWhiteSpace(environment))
+				return ConfigurationContainer = new ConfigurationBuilder()
+					.SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
+					.AddJsonFile($"appsettings.shared.json").Build();
+
+			return ConfigurationContainer = new ConfigurationBuilder()
+				.SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
+				.AddJsonFile($"appsettings.shared.{environment}.json").Build();
+		}
+		catch (Exception ex)
+		{
+			throw;
+		}
+	}
+}

MyOffice.Shared/MyOffice.Shared.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>net6.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<None Remove="appsettings.shared.Development.json" />
+		<None Remove="appsettings.shared.json" />
+		<None Remove="appsettings.shared.Production.json" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<Content Include="appsettings.shared.Development.json" CopyToPublishDirectory="Never">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+			<ExcludeFromSingleFile>true</ExcludeFromSingleFile>
+		</Content>
+		<Content Include="appsettings.shared.json">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+			<ExcludeFromSingleFile>true</ExcludeFromSingleFile>
+			<CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
+		</Content>
+		<Content Include="appsettings.shared.Production.json" CopyToPublishDirectory="Never">
+			<CopyToOutputDirectory>Always</CopyToOutputDirectory>
+			<ExcludeFromSingleFile>true</ExcludeFromSingleFile>
+		</Content>
+	</ItemGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="7.0.0" />
+		<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
+	</ItemGroup>
+
+	<ItemGroup>
+		<Reference Include="Microsoft.Extensions.Configuration">
+			<HintPath>C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App\6.0.15\Microsoft.Extensions.Configuration.dll</HintPath>
+		</Reference>
+		<Reference Include="Microsoft.Extensions.Configuration.Abstractions">
+			<HintPath>C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App\6.0.15\Microsoft.Extensions.Configuration.Abstractions.dll</HintPath>
+		</Reference>
+	</ItemGroup>
+
+</Project>

MyOffice.Shared/appsettings.shared.json

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+{
+	"ConnectionStrings": {
+		"sqlite": "Filename=AppDbContext.Dev.db",
+		"mssql": "",
+		"npgsql": ""
+	}
+}