fix bug teta detection close of 0.0 and add readme

src/polygon_draw.rs

@@ -110,10 +110,13 @@ pub struct Polygon {
 #[warn(dead_code)]
 impl Polygon {
     pub fn have_points_btw(&self, before: f32, after: f32) -> bool {
+        if after < before {
+            return self.have_points_btw(before, 2.0 * PI) || self.have_points_btw(0.0, after);
+        }
         let mut p_g;
         for p in self.points_teta.clone() {
             p_g = p + self.global_teta;
-            if before < p_g && p_g < after {
+            if before <= p_g && p_g <= after {
                 return true;
             }
             if p_g > after {