Update readme.md

Add comments on the template pattern

Author: dancergraham

chapter08_template/readme.md

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 # Chapter 8: Template design pattern
 
 > **Template Method**: Define the skeleton of an algorithm in an operation, deferring some steps to subclasses. Template Method lets subclasses redefine certain steps of an algorithm without changing the algorithm's structure.
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+The template design pattern is widely used in frameworks such as Django, providing base classes which can be extended to provide required methods.
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+Variants of the template pattern are found throughout the Python object model, for instance iterable sorting is implemented by running the *less than* (`__lt__`) comparison operator between items in the collection. In this sense the [list sorting algorithm](https://docs.python.org/3/howto/sorting.html#odd-and-ends) is a partial implementation of sort, delegating the comparison behavior to individual objects.