update config: add keywords, add requirements, update --config descri…

…ption

src/agat/agat_sp_add_splice_sites/config.vsh.yaml

@@ -4,7 +4,7 @@ description: |
   The script aims to add splice sites features (five_prime_cis_splice_site
   and three_prime_cis_splice_site) to gtf/gff file. The splice sites are
   deduced from CDS features.
-keywords: [gene annotations]
+keywords: [gene annotations, splice sites, gff]
 links:
   homepage: https://github.com/NBISweden/AGAT
   documentation: https://agat.readthedocs.io/en/latest/tools/agat_sp_add_splice_sites.html
@@ -13,6 +13,8 @@ links:
 references: 
   doi: 10.5281/zenodo.3552717
 license: GPL-3.0
+requirements:
+  - commands: [agat]
 authors:
   - __merge__: /src/_authors/leila_paquay.yaml
     roles: [ author, maintainer ]
@@ -41,7 +43,7 @@ argument_groups:
       - name: --config
         alternatives: [-c]
         description: |
-          Input agat config file. By default AGAT takes as input agat_config.yaml file from the working directory if any, otherwise it takes the original agat_config.yaml shipped with AGAT. To get the agat_config.yaml locally type: `agat config --expose`. The `--config` option gives you the possibility to use your own AGAT config file (located elsewhere or named differently).
+          AGAT config file. By default AGAT takes the original agat_config.yaml shipped with AGAT. The `--config` option gives you the possibility to use your own AGAT config file (located elsewhere or named differently).
         type: file
         required: false
         example: custom_agat_config.yaml