Moved repository interfaces to application layer, created blank visa requests handler

SchengenVisaApi/ApplicationLayer/Common/IApplicantsRepository.cs

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+using Domains.ApplicantDomain;
+
+namespace ApplicationLayer.Common;
+
+/// Repository pattern for <see cref="Applicant"/>
+public interface IApplicantsRepository : IGenericRepository<Applicant> { }

SchengenVisaApi/ApplicationLayer/Common/IGenericRepository.cs

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+using Domains;
+
+namespace ApplicationLayer.Common;
+
+/// <summary>
+/// Generic repository pattern
+/// </summary>
+/// <typeparam name="T">Entity type</typeparam>
+public interface IGenericRepository<T> where T : class, IEntity
+{
+    /// Get all entities from data storage
+    Task<List<T>> GetAllAsync(CancellationToken cancellationToken);
+
+    /// Get one entity with specific id
+    /// <param name="id">Identifier of entity</param>
+    Task<T> GetOneAsync(Guid id, CancellationToken cancellationToken);
+
+    /// Add entity to storage
+    /// <param name="entity">Entity to add</param>
+    Task AddAsync(T entity, CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Update entity in storage
+    /// </summary>
+    /// <param name="entity">Entity to update</param>
+    Task UpdateAsync(T entity, CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Remove entity from storage
+    /// </summary>
+    /// <param name="entity">Entity to remove</param>
+    void Remove(T entity);
+
+    /// Save changes in storage
+    Task SaveAsync(CancellationToken cancellationToken);
+}

SchengenVisaApi/ApplicationLayer/VisaApplication/Services/VisaApplicationRequestsHandler.cs

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+namespace ApplicationLayer.VisaApplication.Services
+{
+    /// Handles visa requests
+    public class VisaApplicationRequestsHandler()
+    {
+        public void HandleCreateRequest(CreateVisaApplicationRequest request)
+        {
+
+        }
+    }
+}