Include a getting help sect on readme
Include a getting help sect on readme

Also add the gitter badge
eusoubrasileiro/fatiando,mtb-za/fatiando,santis19/fatiando,mtb-za/fatiando,rafaelmds/fatiando,drandykass/fatiando,fatiando/fatiando,santis19/fatiando,cmeessen/fatiando,eusoubrasileiro/fatiando_seismic,eusoubrasileiro/fatiando_seismic,cmeessen/fatiando,eusoubrasileiro/fatiando,rafaelmds/fatiando,victortxa/fatiando,fatiando/fatiando,eusoubrasileiro/fatiando,victortxa/fatiando,drandykass/fatiando