feat: adding somme new transformation

* Rotate to rotate the image, !! Some point could be outside of the
  0-4096 range on x and y !!
  you should parameter a center and an angle. All the point will move
  around the center. The angle is un degre.
* Flip vertical: flip all the point verticaly. You should parameter an
  height where all point will flip
* Flip horizontaly. You should parameter an X corrodinate where all
  point will flip around.

src/transformer/flip_vertical.rs

@@ -0,0 +1,28 @@
+use crate::transformer::Transformers;
+use crate::point::Point;
+use serde::{Serialize,Deserialize};
+
+/// Flip Vertical
+
+#[derive(Serialize,Deserialize,Debug,Clone,Copy)]
+pub struct FlipVertical {
+    y: f32,
+}
+
+impl FlipVertical {
+    pub fn new(y: f32) -> Self {
+        Self {y}
+    }
+}
+
+impl Transformers for FlipVertical {
+    fn apply(&self, point_list: &[Point]) -> Vec<Point> {
+    point_list.iter()
+        .map(| pt | {
+            let dy = pt.y - self.y;
+            Point { y: dy - 2. * dy,
+                ..*pt
+            }
+        }).collect()
+    }
+}