Merge pull request #9 from epogrebnyak/master

Readme for course files

examples/academy_course_PYT26038/README.md

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+These files support open course [Analysis of Credit Migration using Python TransitionMatrix](https://www.openriskacademy.com/enrol/index.php?id=38).
+
+- [Step 1: Working with a Transition Matrix object](step1.py)
+- [Step 2: Working with Multi-Period Transition Matrices](step2.py)
+- [Step 3: Estimating a Transition Matrix from Data in Cohort Format](step3.py)
+- [Step 4: Estimating a Transition Matrix using Data in Duration Format](step4.py)
+- [Step 5: Illustration using Credit Migration data from LendingClub](step5.py)