Update README.md

Author: balis

examples/ChoiceJoinMerge/README.md

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+# Choice and Join process types
 
+This example demonstrates how to achieve the following workflow patterns:
+- Produce results on a subset of outputs (multi-choice)
+- Activate process on n-out-of-m inputs (discriminator)
+- Combine the above, i.e. "choice" process sends information to "join" process on how many outputs have been activated (structured synchronizing merge)
+
+<P></P>
+The workflow has two processes:
+
+- <TT>WriteRandOuts</TT> randomly produces results on 0-3 of its outputs
+- <TT>ReadRandIns</TT> is activated by <TT>n-out-of-3</TT> inputs, where <TT>n</TT> is the number of branches activated by the first process.  
+  
+<P>
+  To achieve this, the process are connected by the <TT>merge</TT> control signal. See the <A HREF=https://github.com/hyperflow-wms/hyperflow/wiki/Workflow-patterns>Structured synchronizing merge</A> to learn more about using this pattern.