add a basic README.md (mongodb#3)

README.md

@@ -1,5 +1,28 @@
-A MongoDB Dialect for the Hibernate ORM
+# A MongoDB Dialect for the Hibernate ORM
 
-## Build
+This project aims to provide a library to seamlessly integrate MongoDB with Hibernate ORM. Hibernate _ORM_ is a powerful **O**bject-**r**elational **m**apping tool. Due to the SQL and JDBC standards, Hibernate ORM could centralize each SQL vendor's idiosyncrasies in the so-called _Hibernate Dialect_. This project will include a document database member in the Hibernate's Dialect family.
 
-## IntelliJ IDEA
+## Overview
+
+MongoDB speaks _MQL_ (**M**ongoDB **Q**uery **L**anguage in JSON format) instead of SQL. This project creates a MongoDB Hibernate Dialect by:
+
+- create a JDBC adapter using [MongoDB Java Driver](https://www.mongodb.com/docs/drivers/java-drivers/)
+- translate Hibernate's internal SQL AST into MQL
+
+<img src="hibernate-dialects.png" alt="MongoDB Dialect" width="800"/>
+
+## Development
+
+Java 17 is the JDK version for development.
+
+Initially Hibernate ORM v6.6 is the dependency version.
+
+### Build from source
+
+### Test
+
+## References
+
+- [An Introduction to Hibernate 6](https://docs.jboss.org/hibernate/orm/6.6/introduction/html_single/Hibernate_Introduction.html)
+- [A Guide to Hibernate Query Language](https://docs.jboss.org/hibernate/orm/6.6/querylanguage/html_single/Hibernate_Query_Language.html)
+- [Hibernate User Guide](https://docs.jboss.org/hibernate/orm/6.6/userguide/html_single/Hibernate_User_Guide.html)