Add link to Pandas

README.md

@@ -620,6 +620,7 @@ laboratories. Here is a list of online resources, which might be useful.
 
  - [Python](https://docs.python.org/3/) documentation
  - [Numpy and Scipy](https://docs.scipy.org/doc/) documentation
+ - [Pandas](https://pandas.pydata.org/) documentation
  - [Matplotlib](http://matplotlib.org/contents.html) documentation
  - [Orthogonal distance regression](https://docs.scipy.org/doc/scipy/reference/odr.html) - least square fit, which considers
    uncertainties in $`x`$ and $`y`$ directions.