Update README.md

Author: phillipai

day18/README.md

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 # Day 18 - Turtle & the Graphical User Interface (GUI)
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+## Concepts Practised
+- Understanding Turtle Graphics and How to use the Documentation
+- Importing Modules, Installing Packages, and Working with Aliases
+- Python Tuples and How to Generate Random RGB Colours
 ## The Hirst Painting Project
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 ![day18](https://user-images.githubusercontent.com/98851253/154783750-d3f360c9-d877-4db9-ab81-37c058c394d3.gif)