Added computer example.

Author: Clément

source/code/projects/Computer/Computer/Computer.cs

@@ -0,0 +1,6 @@
+class Computer{
+    private string brand;
+    public void SetBrand(string brandP){ brand = brandP; }
+    public Computer(string bP){ SetBrand(bP); }
+    public override string ToString(){ return $"Brand: {brand}"; }        
+}

source/code/projects/Computer/Computer/Laptop.cs

@@ -0,0 +1,5 @@
+class Laptop : Computer{
+    public int ScreenSize{get; set;}
+    public Laptop(int ssP, string bP):base(bP){ScreenSize = ssP;}
+    public override string ToString(){ return base.ToString() + $"\nScreen size: {ScreenSize}\""; }        
+}

source/code/projects/Computer/Computer/Program.cs

@@ -0,0 +1,12 @@
+using System;
+
+public class Program{
+    public static void Main(){
+        Computer test1 = new Computer("Framework");
+        Console.WriteLine(test1);
+        Laptop test2 = new Laptop(12, "ThinkPenguin");
+        Console.WriteLine(test2);
+        
+    }
+    
+}