diff --git a/SweetLib.IO/SweetLib.IO.csproj b/SweetLib.IO/SweetLib.IO.csproj
new file mode 100644
index 0000000..471d29a
--- /dev/null
+++ b/SweetLib.IO/SweetLib.IO.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SweetLib\SweetLib.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/SweetLib.sln b/SweetLib.sln
index 6673fc1..ec94494 100644
--- a/SweetLib.sln
+++ b/SweetLib.sln
@@ -9,6 +9,12 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SweetLib.Demo.Console", "Sw
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SweetLib", "SweetLib\SweetLib.csproj", "{7C15F2F3-2BF2-46FB-B813-9EEC1B41D679}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Demo", "Demo", "{5C88E7F1-525D-4FF5-B7CE-2E02EC22BD9A}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{9036EBA5-45D0-441D-9C81-AF4F86C8A8F8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SweetLib.IO", "SweetLib.IO\SweetLib.IO.csproj", "{0874043E-42B3-43B2-B3BB-726CEE4142E9}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,10 +33,21 @@ Global
 		{7C15F2F3-2BF2-46FB-B813-9EEC1B41D679}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7C15F2F3-2BF2-46FB-B813-9EEC1B41D679}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7C15F2F3-2BF2-46FB-B813-9EEC1B41D679}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0874043E-42B3-43B2-B3BB-726CEE4142E9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0874043E-42B3-43B2-B3BB-726CEE4142E9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0874043E-42B3-43B2-B3BB-726CEE4142E9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0874043E-42B3-43B2-B3BB-726CEE4142E9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{9350E0D4-9FE7-49D5-ACDE-E857E547889C} = {5C88E7F1-525D-4FF5-B7CE-2E02EC22BD9A}
+		{C8681E08-6F23-45E1-A16F-BBA72003219B} = {5C88E7F1-525D-4FF5-B7CE-2E02EC22BD9A}
+		{7C15F2F3-2BF2-46FB-B813-9EEC1B41D679} = {9036EBA5-45D0-441D-9C81-AF4F86C8A8F8}
+		{5C88E7F1-525D-4FF5-B7CE-2E02EC22BD9A} = {9036EBA5-45D0-441D-9C81-AF4F86C8A8F8}
+		{0874043E-42B3-43B2-B3BB-726CEE4142E9} = {9036EBA5-45D0-441D-9C81-AF4F86C8A8F8}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {7AF4F0AF-F1C1-473C-BEE3-8C2B6DAEBF35}
 	EndGlobalSection