LMS-1491 example screening db for tests

SVN: 15597

screening/resource/examples/store-demo-readme.txt

-Store with images and csv files can be found on:
-    vesuvio:~cisd/screening/store-screening-demo.zip
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+Demo data to test screening openbis.
+- The db should be restored to 'openbis_screening_demo'.
+- Store with images and csv files can be found on:
+    vesuvio:~cisd/screening/store-screening-demo.zip
+  It should be unpacked to targets/store.
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