Feat: First structure

src/main.rs

@@ -0,0 +1,34 @@
+use clap::{Parser, Subcommand};
+
+#[derive(Parser)]
+#[command(version, about, long_about = None)]
+struct Cli {
+    // The sudoku field given as a 1x81 string from left to right, top to bottom, 0 denotes value
+    // absense
+    field: String,
+}
+
+struct Playfield {
+    fields: [[Field; 9]; 9],
+    open_fields: Vec<u8>,
+}
+
+struct Field {
+    possible_values: [u8; 9],
+    value: Option<u8>,
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    let playfield = parse_field(&cli.field);
+
+    println!("Hello, world!");
+}
+
+fn parse_field(field: &String) -> Playfield {}
+
+mod tests {
+    #[test]
+    fn test_parse_field() {}
+}