Add params ability

[co1emi11er2]

This update adds the following:

• Adds the ability to accept parameters

For example:

julia> a, b  = 1, 2
(1, 2)

julia> @handcalcs a, b
L"$\begin{aligned}
a &= 1
\\[10pt]
b &= 2
\end{aligned}$"