Add README.

nelkinda · Aug 14, 2021 · 1466071 · 1466071
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-# expensereport
-The ExpenseReport legacy code refactoring example in various languages
+# ExpenseReport
+The ExpenseReport legacy code refactoring example in various languages.
+
+This is an example of a piece of legacy code with lots of code smells.
+The goal is to support the following new feature as best as you can:
+* Add Lunch with an expense limit of 2000.
+
+## Process
+1. Read the code to understand what it does and how it works.
+2. Read the code and check for design smells.
+3. Analyze what you would have to change to implement the new requirement without refactoring the code.
+4. Write a characterization test.
+5. Refactor the code.
+6. Test-drive the new feature.