Update README.md

## Description

The cadcAccessControl module contains the shared model classes and exceptions used by the access control clients and server.  It also contains the UserClient and GMSClient (group management service client).

## Build Dependencies

## Build and Test Dependencies

### opencadc dependencies:

- opencadc/core/cadcUtil

- opencadc/reg/cadcRegistry

### external dependencies

- json.jar

- jdom2.jar

- javacsv.jar

- log4j.jar

- unboundid-ldapsdk-se.jar

### external build dependencies

- json.jar (json.org-20110818.jar)

- jdom2.jar (jdom-2.0.5.jar)

- log4j.jar (log4j-1.2.17.jar)

### external test dependencies

- xerces.jar (xerces-2_9_1)

- asm.jar (hibernate-3.2.3)

- cglib.jar (hibernate-3.2.3)

- easymock.jar (easymock-3.0.jar)

- junit.jar (junit-4.6.jar)

- objenesis.jar (objenesis-1.2.jar)