SLING-4381 add READMEs, make factory configuration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1680622 13f79535-47bb-0310-9956-ffa450edef68
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+Apache Sling NoSQL Couchbase Client

+===================================

+

+Provides preconfigured clients for accessing a [Couchbase](http://www.couchbase.com/) NoSQL database.

+

+* Wraps the [Couchbase Java Client 2.x](https://github.com/couchbase/couchbase-java-client) and exports it via OSGi

+* Includes private dependencies of Couchbase Java Client

+* The couchbase access parameters can be configured via OSGi configuration.

+* Multiple couchbase clients can be configured for different couchbase hosts and/or buckets