Add README

README.md

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+# Advent Of Code
+
+Year | Lang | Stars
+-----|------|-------
+2023 | Rust | 24
+
+## Rust
+
+1. Create folder `src/year_2023/day_XX_name`
+
+2. Create `mod.rs`, `part_one.rs`, Optionally `common.rs`, `part_two.rs`
+
+3. Edit `mod.rs`
+
+```rust
+pub mod part_one;
+pub mod part_two;
+pub mod common;
+
+use crate::utils::solution::Solution;
+use crate::utils::input_reader;
+
+pub struct DaySolution ;
+
+
+impl Solution for DaySolution {
+
+    fn input_path(&self) -> &'static str {
+        "input/XXXX/day_XX/input.txt"
+    }
+
+    fn part_one(&self) -> String {
+        input_reader::read_input_file(self.input_path(), part_one::part_one)
+    }
+
+    fn part_two(&self) -> String {
+        input_reader::read_input_file(self.input_path(), part_two::part_two)
+        // String::from("Not implemented")
+    }
+}
+```
+
+4. Edit `mod.rs` in `year_XXXX` folder
+
+```rust
+pub mod day_XX_problem_name;
+//...
+let solution: Box<dyn Solution> = match day {
+        // ...
+        "XX" => Box::new(day_XX_problem_day::DaySolution),
+        // ...
+```
+
+5. Copy input into `input/XXXX/day_XX/input.txt`
+
+6. Run
+
+```sh
+cargo run <year> <day>
+```