Write a function polyfit file() which - receives as first input argument a file name as a string and as second a polynomial degree value, an integer, see description below.

- Read data from file, see below, and

- perform a polynomial fit to the given polynomial degree.

- Read data from file using the NumPy function loadtxt(). The test data will contain two-column floating point data, for x and y values. You do not have to set delimiter parameter to read data.

- Research and then use the NumPy function polyfit() for the fitting to the data.

- Return the array of fit coefficients which is the immediate outcome of the polyfit() function.