Provide forces?

[RobertaFarris93]

tdep-tutorials/06_Infrared/README.md

Lines 254 to 257 in ee5acca

	- Perform sTDEP sampling for MgO at 300K until you reach convergence
	- Extract 2nd and 3rd order force constants
	- Copy `infile.ucposcar`, `infile.lotosplitting` and the `infile.forceconstant` + `infile.forceconstant_thirdorder` into a new folder
	- Run `lineshape` with `lineshape --temperature TEMPERATURE --qpoint Q1 Q2 Q3 --qdirin Q1 Q2 Q3` where you fill the numbers according to the considerations above. This will produce the phonon spectral function and write it to `outfile.phonon_self_energy.hdf5`

Can we provide the force constants just in case someone cannot finish the tutorial? (or link the previous tutorial where we get those?)