Updated README.md

Added a few lines detailing the aims of this project.

Author: JamesHarcourt7

README.md

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 Hi! This repository will contain my attempts at each challenge for the [Advent of Code](https://adventofcode.com/) puzzle advent calendar, released every year for the festive season. I'll be competing with my coursemates this year on a private leaderboard- so hopefully I'll stay motivated to get as far as I can.
 
+My aim for this project is to practice coding in Java, a language I have only recently been learning through university. I would like to get comfortable enough to begin writing larger applications, so Advent of Code is a great way to improve not only familiarity with the language but also my computational thinking skills.
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 Best of luck to anyone else participating this year. :christmas_tree:
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