earajr/GFS_plotting: First release of GFS plotting repository

The Global Challenges Research Fund (GCRF) African SWIFT (Science for Weather Information and Forecasting Technology) project GFS plotting software consists of shell and python scripts. They are designed to allow users to generate useful images for research and operational use from both operational and archived Global Forecast System (GFS) numerical weather prediction (NWP) data. The plotting scripts are modular and allow for users to select which variables, forecast times and levels they wish to generate images for. It is hoped that the development of further modules in the future can provide even more useful insight and that the structure of the surrounding code will allow these to be simply be included into routine operational/research work across African met centres and research groups interested in the use of GFS NWP imagery.