RBDC-Oracle

* a simple oracle driver for rbatis


# Requirements
- C linker. For example:
```
sudo apt install build-essential
```

- Rbatis. See [Rbatis](https://github.com/rbatis/rbatis)

- Oracle client 11.2 or later. See [ODPI-C installation document](https://oracle.github.io/odpi/doc/installation.html)