Initial commit.

- Created and set up main projects
- Created classes for Domain

PhonebookService.Domain/Queries/PhonebookFilterQuery.cs

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+namespace PhonebookService.Domain.Queries;
+
+/// <summary>
+/// A model that represents a search/filter query for phonebook
+/// </summary>
+public class PhonebookFilterQuery
+{
+	/// <summary>
+	/// Number of a page to show. Starts from one.
+	/// </summary>
+	/// <value>Default is 1</value>
+	public int Page { get; set; } = 1;
+
+	/// <summary>
+	/// Optional property to filter records that contain the value in their <see cref="Models.PhonebookRecord.FirstName"/>
+	/// </summary>
+	public string? FirstName { get; set; }
+
+	/// <summary>
+	/// Optional property to filter records that match the city name
+	/// </summary>
+	public string? City { get; set; }
+
+	/// <summary>
+	/// Optional property to filter records that match the phone number
+	/// </summary>
+	public string? Phone { get; set; }
+
+	/// <summary>
+	/// Optional property to filter records that match the zip code
+	/// </summary>
+	public string? ZipCode { get; set; }
+
+	/// <summary>
+	/// Optional property to sort the result collection by <see cref="FirstName"/>
+	/// </summary>
+	/// <value>Default is 0 (None)</value>
+	public SortMode Sort { get; set; } = SortMode.None;
+}

PhonebookService.Domain/Queries/SortMode.cs

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+namespace PhonebookService.Domain.Queries;
+
+/// <summary>
+/// Sorting options for <see cref="PhonebookFilterQuery"/>
+/// </summary>
+public enum SortMode
+{
+	Ascending = 1,
+	None = 0,
+	Descending = -1
+}