basic README to explain repo

README.md

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+# Advent of Code 2023
+
+## About
+
+This repository stores my solutions to the daily challenges of [Advent of Code Calendar 2023](https://adventofcode.com/2023/).
+
+## Execution
+
+Any of the scripts can be executed directly using [NodeJS](https://nodejs.org/en/download/).
+
+**Example:**
+
+```bash
+cd Day01/
+node Part1.js
+```
+
+## File explanation
+
+A single challenge consists of 3 files:
+
+- `input.txt`: My input data, as provided by AoC.
+- `Part1.js`: My solution to part 1 of the challenge.
+- `Part2.js`: My solution to part 2 of the challenge.
+
+Other special files:
+
+- [`template.js`](template.js): A template file to use when initializing a new challenge.
+- `sample.js`: Example or test code; Ignored by git (see [.gitignore](.gitignore)).