Add project files.

Core.Cerberos.Infraestructure/Caching/Contracts/ICacheService.cs

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+namespace Core.Cerberos.Infraestructure.Caching.Contracts
+{
+    public interface ICacheService
+    {
+        Task<T> GetAsync<T>(string key);
+        Task SetAsync<T>(string key, T value, TimeSpan? expiry = null);
+        Task RemoveAsync(string key);
+        Task<bool> ExistsAsync(string key);
+        Task RefreshAsync(string key, TimeSpan? expiry = null);
+    }
+}