Add project files.

Core.Cerberos.Infraestructure/Contexts/Mongo/ConnectionStringProvider.cs

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+using Microsoft.Extensions.Configuration;
+
+namespace Core.Cerberos.Infraestructure.Contexts.Mongo
+{
+    public class ConnectionStringProvider(IConfiguration configuration) : IConnectionStringProvider
+    {
+        public string ConnectionString { get; set; } = string.Empty;
+        public string Databasename { get; set; } = string.Empty;
+        public string Audience { get; set; } = string.Empty;
+
+        public string GetConnectionString()
+        {
+            return configuration?.GetConnectionString("DefaultConnection")?.ToString() ?? string.Empty;
+        }
+        public string GetDatabasename()
+        {
+            return configuration.GetSection("MongoDb:DatabaseName").Value ?? string.Empty;
+        }
+
+        public string GetAudience()
+        {
+            return configuration.GetSection("MongoDb:Audience").Value ?? string.Empty;
+        }
+    }
+    public interface IConnectionStringProvider
+    {
+        string GetConnectionString();
+        string GetDatabasename();
+        string ConnectionString { get; set; }
+        string Databasename { get; set; }
+        string Audience { get; set; }
+    }
+}