Add mailmap file

[samaloney]

Before

   154  Ewan Dickson <35922612+grazwegian@users.noreply.github.com>
    65  Richard <rschwartz70@gmail.com>
    63  paolomassa <paolocrmassa@gmail.com>
    48  Shane Maloney <shane.maloney@tcd.ie>
    45  FredericSchuller <fschuller@aip.de>
    40  Laszlo I. Etesi <laszlo.etesi@fhnw.ch>
    27  nicHoch <nicky@horzelbuben.de>
    23  Laszlo Istvan Etesi <laszlo.etesi@fhnw.ch>
    12  Shane Maloney <shane.maloney@dias.ie>
    11  Ewan Dickson <ewan.dickson@uni-graz.at>
     8  Frederic Schuller <36623402+FredSchuller@users.noreply.github.com>
     7  Paolo Massa <64010598+paolomassa@users.noreply.github.com>
     6  paolomassa <64010598+paolomassa@users.noreply.github.com>
     5  afbattaglia <57705509+afbattaglia@users.noreply.github.com>
     3  Nicky Hochmuth <nicky.thecrag@gmail.com>
     3  NickyHochmuth <nicky@horzelbuben.de>
     3  annavolp <94917296+annavolp@users.noreply.github.com>
     2  Andrea Francesco Battaglia <andreafrancesco.battaglia@gmail.com>
     2  Laszlo Istvan Etesi <laszlo.etesi@knowleech.ch>
     2  federico <benvenuto@dima.unige.it>
     2  nicHoch <user@ax.i4ds.ch>
     2  root <root@pub099.cs.technik.fhnw.ch>
     2  samaloney <shane.maloney@tcd.ie>
     1  Andrea Battaglia <57705509+afbattaglia@users.noreply.github.com>
     1  Andrea Francesco Battaglia <andrea.battaglia@fhnw.ch>
     1  GitHub Action test <test@github.com>
     1  Shane Maloney <maloneys@tcd.ie>
     1  annavolp <volparaanna@gmail.com>
     1  mithunnps <mithunnps@gmail.com>
     1  tomekmrozek <mrozek@astro.uni.wroc.pl>

after

   165  Ewan Dickson <ewan.dickson@uni-graz.at>
    76  Paolo Massa <paolo.massa@fhnw.ch>
    65  Laszlo Etesi <laszlo.etesi@ateleris.ch>
    65  Richard <rschwartz70@gmail.com>
    64  Shane Maloney <shane.maloney@dias.ie>
    53  FredericSchuller <fschuller@aip.de>
    35  Nicky Hochmuth <nicky.hochmuth@ateleris.ch>
     9  Andrea Francesco Battaglia <andreafrancesco.battaglia@gmail.com>
     4  Anna Volpara <volparaanna@gmail.com>
     2  federico <benvenuto@dima.unige.it>
     2  root <root@pub099.cs.technik.fhnw.ch>
     1  GitHub Action test <test@github.com>
     1  mithunnps <mithunnps@gmail.com>
     1  tomekmrozek <mrozek@astro.uni.wroc.pl>