add exercises.md

Author: rofr

exercises.md

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+# Exercises
+
+
+
+# M0 - Hello world
+## Ex 1
+* Create a maven project and add a dependency to org.springframework spring-context using the latest GA version of spring framework 5. See docs att https://spring.io
+* Create a MessagePrinter class that prints a message to the console.
+* Add an Application class with a main method.
+* In the main() method create an instance of an AnnotationConfigApplicationContext and configure it with a MessagePrinter bean.
+* Obtain a MessagePrinter from the context and call the message-printing method 
+
+## Ex 2
+Download and extract the spring-framework-5.x.x.RELEASE distribution from https://repo.spring.io
+Examine the docs, schemas and jar files.
+
+# M1
+See PDF for M1 exercises
+
+# M2
+Annotate the ecommerce components and make the demo in AppConfig.main() method working.
+
+# M3
+Use java based configuration to define the ecommerce components. See JavaConfig.main()
+
+# M4
+Use xml based configuration to define the ecommerce beans, see XmlConfig.main()