Updated installation instructions of ds example

git-svn-id: https://svn.apache.org/repos/asf/aries/trunk@1687221 13f79535-47bb-0310-9956-ffa450edef68

jpa/examples/tasklist-ds/README.txt

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+Installation instructions on Karaf 4
+
+# Install DB and create DataSource service
+feature:repo-add pax-jdbc 0.6.0
+feature:install jdbc pax-jdbc-h2 pax-jdbc-config pax-jdbc-pool-dbcp2
+jdbc:ds-create -dn H2-pool-xa -url jdbc:h2:mem:tasklist tasklist
+
+# Install hibernate, aries jpa and example
+feature:install scr jpa hibernate/4.3.6.Final http-whiteboard
+install -s mvn:org.apache.aries.jpa.example/org.apache.aries.jpa.example.tasklist.model/2.0.0
+install -s mvn:org.apache.aries.jpa.example/org.apache.aries.jpa.example.tasklist.ds/2.0.0
+
+# This should show three active DS components
+scr:list
+
+# This should show the TaskService
+service:list TaskService
+
+# This should show the TasklistServlet
+http:list
+
+
+# Now open the url 
+http://localhost:8181/tasklist
+# You should see one task named Task1
+