Add project files.

Core.Blueprint.Mongo/Provider/MongoProvider.cs

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+using MongoDB.Driver;
+
+namespace Core.Blueprint.Mongo
+{
+    /// <summary>
+    /// Provides the MongoDB provider and database connection using the specified configuration settings.
+    /// This class manages the connection to MongoDB and ensures that the correct credentials are used for authentication.
+    /// </summary>
+    public class MongoProvider
+    {
+        private readonly IMongoDatabase _database;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MongoProvider"/> class.
+        /// This constructor sets up the MongoDB provider using the connection string, audience, and other settings provided.
+        /// It also configures authentication using OpenID Connect (OIDC) credentials.
+        /// </summary>
+        /// <param name="mongoDbSettings">The MongoDB settings required for connecting to the database.</param>
+        public MongoProvider(IMongoDatabase database)
+        {
+            _database = database ?? throw new ArgumentNullException(nameof(database));
+        }
+
+        /// <summary>
+        /// Gets the initialized MongoDB database. If the database is not initialized, an exception is thrown.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">Thrown when the database connection is not initialized.</exception>
+        protected IMongoDatabase Database
+        {
+            get
+            {
+                if (_database == null)
+                {
+                    throw new InvalidOperationException("MongoDB connection is not initialized.");
+                }
+                return _database;
+            }
+        }
+    }
+}