added empty emfStore instance

fortiss-std-env/defaultEMFStore/README

+1. Extract the emfStoreHome.tar.gz to a target location on your harddisk.
+2. Create an Eclipse application run configuration for Your local emfStore server.
+  a. Set its workspace to a desired workspace folder, e.g. ${workspace_loc}/../runtime-LocalEMFStoreServer
+  b. Select the org.unicase.emfstore.server product to be launched by this runconfig.
+  c. Go to the arguments tab and enter the following program argument using the targetlocation from step 1
+     -EMFStoreHome=<Location chosen in step 1>/emfStoreHome
+3. Launch the server application.
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