added projection functin

test/test_projection.py

@@ -0,0 +1,10 @@
+from  matrixmania import project_ortho
+
+def test_projection_1():
+    point = (1.0, 2.0, 3.0)
+    assert project_ortho(point) == (1.0, 2.0)
+
+def test_projection_2():
+    point = (1.0, 2.0, 3.0)
+    scale = 100
+    assert project_ortho(point, scale) == (100.0, 200.0)