Add dictionaries conten (#6365)

* Update dictionaries@bc9CL_HMT-R6nXO1eR-gP.md

* Update src/data/roadmaps/python/content/dictionaries@bc9CL_HMT-R6nXO1eR-gP.md

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/python/content/dictionaries@bc9CL_HMT-R6nXO1eR-gP.md

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 # Dictionaries
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+In Python, a dictionary is a built-in data type that allows you to store key-value pairs. Each key in the dictionary is unique, and each key is associated with a value. Dictionaries are unordered collections, meaning the order of items is not guaranteed.
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+Learn more from the following resources:
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+- [@article@W3 Schools - Dictionaries](https://www.w3schools.com/python/python_dictionaries.asp)