FRX instrument initial import
Firt header's parser implementation
Pre final XRF implementation
Last FRX implementation before receive more .csv example files
memoize utils.getUsers
 Actualization axios_xrf init to accept more superq type files

 We actaulized module to read other superq type files, but at present we need more examples to improve the module.
 I don't know what are some field
 Add samples directory
 Last corrections
 Last check before merge
Merge branch 'feature/instrument-interface-frx' into develop
Merge branch 'develop' into feature/sampling-rounds