restructure

src/QuickDish.Core/QuickDish.Core.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

src/QuickDish.Core/Recipe.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QuickDish.Core;
+
+/// <summary>
+/// The base recipe class which holds basic tags defining the recipe, a title, a short description and an image and pdf url for the actualy recipe.
+/// </summary>
+internal class Recipe
+{
+    public string Title { get; set; }
+    public string Description { get; set; }
+    public string[] Tags { get; set; }
+
+    public string ImageUrl { get; set; }
+    public string RecipeUrl { get; set; }
+
+    public Recipe(string title, string description, string[] tags, string imageUrl, string recipeUrl)
+    {
+        if (string.IsNullOrWhiteSpace(title))
+            throw new ArgumentException("Title can't be empty", nameof(title));
+        if (string.IsNullOrWhiteSpace(description))
+            throw new ArgumentException("Description can't be empty", nameof(description));
+        if (string.IsNullOrWhiteSpace(recipeUrl))
+            throw new ArgumentException("The Url to the Recipe can't be empty", nameof(recipeUrl));
+        if (string.IsNullOrWhiteSpace(imageUrl))
+            throw new ArgumentException("The Url to the Image of the Recipe can't be empty", nameof(imageUrl));
+
+        Title = title;
+        Description = description;
+        Tags = tags;
+        ImageUrl = imageUrl;
+        RecipeUrl = recipeUrl;
+    }
+}

src/QuickDish.Core/User.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QuickDish.Core;
+
+internal class User
+{
+    public int Id { get; set; }
+    public string Username { get; set; }
+    public string PasswordHash { get; set; }
+
+}