add project files

MCEmuCore.System/Class1.cs

@@ -0,0 +1,8 @@
+using System;
+
+namespace MCEmuCore.System
+{
+    public abstract class System
+    {
+    }
+}

MCEmuCore.System/MCEmuCore.System.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Interfaces\" />
+  </ItemGroup>
+
+</Project>