Update Vector3.cpp

Added missing Vector3::One

src/J3ML/LinearAlgebra/Vector3.cpp

@@ -10,6 +10,7 @@
 namespace J3ML::LinearAlgebra {
 
     const Vector3 Vector3::Zero     = {0,0,0};
+    const Vector3 Vector3::One      = {1, 1, 1};
     const Vector3 Vector3::Up       = {0, -1, 0};
     const Vector3 Vector3::Down     = {0, 1, 0};
     const Vector3 Vector3::Left     = {-1, 0, 0};