format of the folders changed

lexique_to_opale/README.md

 # Converter lexique_to_opale
 
 In order to use this converter, follow those steps :
+0. Create an input and an output directory
 1. Copy your Lexique file(s) (.scar or .zip) into the input directory.
 2. Execute the run that correspond to your OS.
 3. You will find the result into the output directory. The names of the output are linked to the hour it was processed.

lexique_to_optim/README.md

 # Converter lexique_to_optim
 
 In order to use this converter, follow those steps :
+0. Create an input and an output dir
 1. Copy your Lexique file(s) (.scar or .zip) into the input directory.
 2. Execute the run that correspond to your OS.
 3. You will find the result into the output directory. The name of the output files depends of the hour it was processed.

opale_to_lexique/README.md

 # Converter opale_to_lexique
 
 In order to use this converter, follow those steps :
+0. Create an input and an output folder
 1. Copy your Opale file(s) (.scar or .zip) into the input directory.
 2. Execute the run that correspond to your OS.
 3. You will find the result into the output directory.The name of the output files depends of the hour it was processed.

optim_to_lexique/README.md

 # Converter optim_to_lexique
 
 In order to use this converter, follow those steps :
+0. Create input and output dir
 1. Copy your Optim files (.scar or .zip) into the input directory.
 2. Execute the run that correspond to your OS.
 3. You will find the result into the output directory. The name of the output files depends of the hour it was processed.