add Trianlg and Point classes to geometry

geometry/src/main/java/coppercore/FieldFinder.java

@@ -0,0 +1,7 @@
+package coppercore.geometry
+
+import java.awt.geom.Line2D
+
+public class FieldFinder {
+
+}

geometry/src/main/java/coppercore/Point.java

@@ -0,0 +1,17 @@
+public class Point {
+    private double x;
+    private double y;
+
+    public Point (double x, double y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public double getX () {
+        return x;
+    }
+
+    public double getY () {
+        return y;
+    }
+}

geometry/src/main/java/coppercore/Triangle.java

@@ -0,0 +1,25 @@
+public class Triangle {
+    private Point p1, p2, p3;
+
+    public Triangle (Point p1, Point p2, Point p3) {
+        this.p1 = p1;
+        this.p2 = p2;
+        this.p3 = p3;
+    }
+
+    public boolean isPointInside (Point point) {
+        Triangle t1 = this(point, p2, p3)
+        Triangle t2 = this(p1, point, p3)
+        Triangle t3 = this(p1, p2, point)
+
+        double area = this.getArea()
+
+        double sumOfT = t1.getArea() + t2.getArea(0 + t3.getArea())
+
+        return Math.abs(sumOfT - area) < 0.05
+    }
+
+    public double getArea () {
+        return 0.5 * Math.abs(p1.getX() * (p2.getY() - p3.getY()) + p2.getX() * (p3.getY() - p1.getY()) + p3.getX() * (p1.getY() - p2.getY()))
+    }
+}