Adding decision tree

examples/src/powershell/microservice/readme.md

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+# Microservice example
+
+
+
+# Update Powershell script
+
+The Powershell script does the following:
+
+```mermaid
+
+graph TD
+
+     A(Start script) --> B{Base folder supplied}
+     B --> |No| C(Throw error and exit)
+     B --> |Yes| D{Devops file supplied?} 
+     D --> |No| E{Check if definition <br> in well known location}
+     D --> |Yes| G(Use file)
+     E --> |Yes| F(Download file) 
+     E --> |No| I(Throw error and exit)
+     F --> G
+
+```
+