Update README.md

Author: AnghelLeonard

HibernateSpringBootDataSourceBuilderC3P0Kickoff/README.md

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+**[How To Configure C3P0 Via DataSourceBuilder](https://github.com/AnghelLeonard/Hibernate-SpringBoot/tree/master/HibernateSpringBootDataSourceBuilderC3P0Kickoff)**
 
+**Description:** This is a kickoff application that set up C3P0 via `DataSourceBuilder`. The `jdbcUrl` is set up for a MySQL database. For testing purpose the application uses an `ExecutorService` for simulating concurrent users. 
+
+**Key points:**\
+     - in pom.xml, add the `spring-boot-configuration-processor` dependency\
+     - in pom.xml add the C3P0 dependency\
+     - in application.properties, configure C3P0 via a custom prefix, e.g., `app.datasource.*`\
+     - write a `@Bean` that returns the `DataSource`
+
+**Output sample:**\
+![](https://github.com/AnghelLeonard/Hibernate-SpringBoot/blob/master/HibernateSpringBootDataSourceBuilderC3P0Kickoff/sample.png)