docs: update README.md

README.md

@@ -51,6 +51,8 @@ other_db:
     - faa: "/home/user/other.faa"  # amino acid sequences in fasta format
     - fna: "/home/user/other.fna"  # nucleic acid sequences in fasta format
 strain_library: "/home/user/strain_library.tsv"
+date:
+    - trembl: "2024_07_28"
 candidate_selection:
     - strain_library
     - order  # strain available in the ATCC or DSM collection
@@ -66,6 +68,8 @@ All the `name_db` key correspond to a database, the `dmnd` format is required to
 
 The `strain_library` key just give the path of the strain_library.
 
+The `date` key is used to indicate a publication or update date for a database. This key is optional; without it, the file creation date is written to the summary.out file.
+
 The `candidate_selection` key list the priority order for the selection. In the above case, the sequences in organism/strain find in the strain_library have priority on organism only in external collection. The `other` can be used if you have access on the sequences inside the `other_db`.
 
 The `slurm`, `parallel` and `module` key are optionnal.