refactor into include folder

tests/unit_tests/point_in_triangle_tests.cpp

+#include <gtest/gtest.h>
+#include <triangle.h>
+
+TEST(PointInTriangleTests, PointInTriangle) {
+    Triangle t = Triangle({1, 0.5}, {3, 0.2}, {2, 1}, 0);
+    EXPECT_TRUE(t.pointInTriangle({1.96, 0.467}));
+    EXPECT_FALSE(t.pointInTriangle({1.107,0.834}));
+    EXPECT_FALSE(t.pointInTriangle({2.553, 0.823}));
+    EXPECT_FALSE(t.pointInTriangle({1.63, 0.13}));
+}
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tests/unit_tests/simple_triangle_tests.cpp

-#include "gtest/gtest.h"
-#include "../../src/shapes/triangle.h"
-#include "../../src/intersections/intersections.h"
+#include <gtest/gtest.h>
+#include <triangle.h>
+#include <intersections.h>
 
 TEST (TriangleIntersectionTests, TriangleIntersection) {
-    auto t1 = Triangle(Point(0,0), Point(2,3), Point(5,0), 0);
-    auto t2 = Triangle(Point(3,1), Point(4,3), Point(6,1), 0);
+    auto t1 = Triangle(Point{0,0}, Point{2,3}, Point{5,0}, 0);
+    auto t2 = Triangle(Point{3,1}, Point{4,3}, Point{6,1}, 0);
 
     std::vector<Point> results = intersections(t1, t2);
 

tests/unit_tests/triangulation_tests.cpp

+#include "gtest/gtest.h"
+#include <shapes/point.h>
+
+
+TEST(TriangulationTests, Page3Example) {
+    std::vector<Point> polygon = {
+        {3,48}, {52, 8}, {99,50}, {138,25},
+         {175, 77}, {131, 72}, {111, 113},
+          {72, 43}, {26, 55}, {29, 100}};
+
+     
+}
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