Implement Circle header, rename all files to use .hpp extension.

include/J3ML/LinearAlgebra/Vector.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+
+#include <cstdlib>
+
+namespace J3ML::LinearAlgebra
+{
+    template <uint DIMS, typename T>
+    class Vector {
+    public:
+        enum { Dimensions = DIMS};
+        T elems[DIMS];
+    };
+
+}