Manual radial matrix elements

The program will take the value of the initial angular momentum l₀ (e.g., 0 for s, 1 for p, etc.) as that of the core, and the radial matrix elements will have a magnitude R_l0+1 and R_l0-1 for the l₀+1 and l₀-1 channels (in a.u.), and their phases will be δ_l0+1 and δ_l0-1 (in radians), respectively. These parameters are taking from the user input.