Bootstrap the reactive sample app

ReactiveExample/Program.cs

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+using System;
+
+namespace ReactiveExample {
+	class Program {
+		static void Main (string [] args)
+		{
+			Console.WriteLine ("Hello World!");
+		}
+	}
+}

ReactiveExample/ReactiveExample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>netcoreapp3.1</TargetFramework>
+    </PropertyGroup>
+
+</Project>