Delete override.java.security, since it is very JRE distribution-dependent.
Add more information to README.md.

Explain how to add Maven dependency to your pom.xml. Describe the different ways to explicitly use the Smartcardio Provider. Link to other library intarsys/smartcard-io.
[release] Release jnasmartcardio-0.2.0.

Add CHANGES.md.
[release] Change development version to 0.2.1-SHAPSHOT.