feat: add README.md

Author: jbrun0r

README.md

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+# Project DAO(Data Access Object) with JDBC in Java using MySQL
+
+This project is an implementation of the DAO (Data Access Object) pattern in Java, using JDBC (Java Database Connectivity) to interact with a MySQL database. The DAO pattern is an approach to organize the persistence layer in an application, separating data access operations from business logic.
+
+## About the Project
+
+The project consists of a simple management system for sellers and departments. It allows performing basic CRUD (Create, Read, Update, Delete) operations for sellers and departments, storing the data in a MySQL database.
+
+## Features
+
+The project offers the following features:
+
+- Query seller by ID.
+- Query all sellers.
+- Query sellers by department.
+- Insert new seller.
+- Update seller data.
+- Delete a seller.
+
+## Project Structure
+
+The project is organized into packages, with the following structure:
+
+- `src`: Contains the packages and classes of the project.
+  - `model.entities`: Contains the entity classes of the system.
+    - `Department`: Represents the Department entity.
+    - `Seller`: Represents the Seller entity.
+  - `model.dao`: Contains the interfaces for the DAO classes.
+    - `DepartmentDao`: Interface for the Department DAO.
+    - `SellerDao`: Interface for the Seller DAO.
+  - `model.dao.impl`: Contains the implementations of the DAO interfaces.
+    - `DepartmentDaoJDBC`: Implementation of the Department DAO using JDBC.
+    - `SellerDaoJDBC`: Implementation of the Seller DAO using JDBC.
+  - `db`: Contains the classes related to the database connection.
+    - `DB`: Utility class for configuring the database connection.
+    - `DbException`: Custom exception for handling database errors.
+    - `DaoFactory`: Class for instantiating DAOs.
+  - `db.properties`: Configuration file with the database access information.
+  - `Demo.java`: Demonstration class with examples of using the functionalities.
+
+## How to Use the Project
+
+1. Clone the project repository to your local environment.
+2. Configure the `db.properties` file with the access information to your MySQL database.
+3. Import the project into your preferred Java IDE (such as Eclipse or IntelliJ).
+4. Ensure that the dependencies are correctly configured (e.g., MySQLConnector).
+
+## Class Diagram
+
+<img src="https://github.com/jbrun0r/assets/blob/main/Java-DAO-JDBC/class-diagram.png?raw=true" width="100%">
+
+## Overview of the DAO Pattern
+
+<img src="https://github.com/jbrun0r/assets/blob/main/Java-DAO-JDBC/data-access-object.png?raw=true" width="100%">
+
+## Overview of JDBC
+
+<img src="https://github.com/jbrun0r/assets/blob/main/Java-DAO-JDBC/java-database-connectivity.png?raw=true" width="300px">
+
+## References
+
+- [DevMedia - DAO Pattern: Data Persistence Using the DAO Pattern](https://www.devmedia.com.br/dao-pattern-persistencia-de-dados-utilizando-o-padrao-dao/30999)
+- [Oracle - Java Data Access Object](https://www.oracle.com/technetwork/java/dataaccessobject-138824.html)