addressbook-level4
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Update Appendix A in DG and related PRs
In Appendix A of DG, we give some suggested programming tasks to get started.
However, as the change of codebase, some PRs are incompatible with the current codebase.
For example, we do not have EventCenter now and we do not have XMLStorage.
Let's update the relevant section of AppendixA and related PRs.