Get a basic Flake setup

src/lib.rs

@@ -0,0 +1,63 @@
+#[derive(Clone,Debug,Copy)]
+pub enum CellValue {
+    One,
+    Two,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+    Nine
+}
+
+pub struct Cell {
+    value: Option<CellValue>,
+    candidates: Vec<CellValue>,
+
+}
+
+impl Default for Cell {
+    fn default() -> Cell {
+        Cell {
+            value : None,
+            candidates : vec![
+                CellValue::One,
+                CellValue::Two,
+                CellValue::Three,
+                CellValue::Four,
+                CellValue::Five,
+                CellValue::Six,
+                CellValue::Seven,
+                CellValue::Eight,
+                CellValue::Nine
+            ]
+        }
+    }
+}
+
+#[derive(Default)]
+pub struct Board {
+    cells: [ [ Cell ; 9 ] ; 9 ]
+}
+
+impl Board {
+    fn value(self, x: usize, y : usize) -> Option<CellValue> {
+        self.cells[x][y].value
+    }
+}
+
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}