Add README.md for bindings/java

bindings/java/README.md

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+# Limbo JDBC Driver
+
+The Limbo JDBC driver is a library for accessing and creating Limbo database files using Java.
+
+## Project Status
+
+The project is actively developed. Feel free to open issues and contribute. 
+
+To view related works, visit this [issue](https://github.com/tursodatabase/limbo/issues/615).
+
+## Development
+
+### How to Run Tests
+
+To run tests, use the following command:
+
+```shell
+$ make test
+``` 
+
+### Code Formatting
+
+To unify Java's formatting style, we use Spotless. To apply the formatting style, run:
+
+```shell
+$ make lint_apply
+```
+
+To apply the formatting style for Rust, run the following command:
+
+```shell 
+$ cargo fmt 
+``` 
+
+## Concepts
+
+Note that this project is actively developed, so the concepts might change in the future.
+
+- `LimboDB` represents a Limbo database.
+- `LimboConnection` represents a connection to `LimboDB`. Multiple `LimboConnections` can be created on the same
+  `LimboDB`.
+- `LimboStatement` represents a Limbo database statement. Multiple `LimboStatements` can be created on the same
+  `LimboConnection`.
+- `LimboResultSet` represents the result of `LimboStatement` execution. It is one-to-one mapped to `LimboStatement`.