feat: basic database model

Entities/Category.cs

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+namespace QuotifyBE.Entities
+{
+    public class Category
+    {
+        public int Id { get; set; }
+        public string? Name { get; set; }
+    }
+}

Entities/Image.cs

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+namespace QuotifyBE.Entities
+{
+    public class Image
+    {
+        public int Id { get; set; }
+        public string? Url { get; set; }
+    }
+}

Entities/Quote.cs

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+using System.ComponentModel;
+
+namespace QuotifyBE.Entities
+{
+    public class Quote
+    {
+        public int Id { get; set; }
+        required public string Text { get; set; }
+        required public string Author { get; set; }
+        //public int CategoryId { get; set; }
+        public int ImageId { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime LastUpdatedAt { get; set; }
+        public int UserId { get; set; }
+
+        public User? User { get; set; }
+        public ICollection<QuoteCategory>? QuoteCategories = new List<QuoteCategory>();
+    }
+}

Entities/QuoteCategory.cs

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+namespace QuotifyBE.Entities
+{
+    public class QuoteCategory
+    {
+        public int QuoteId { get; set; }
+        public int CategoryId { get; set; }
+
+        public Quote? Quote { get; set; }
+        public Category? Category { get; set; }
+    }
+}

Entities/User.cs

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+namespace QuotifyBE.Entities
+{
+    public class User
+    {
+        public int Id { get; set; }
+        required public string Name { get; set; }
+        required public string Email { get; set; }
+        required public string PasswordHash { get; set; }
+    }
+}