Populate-database.md

+## 📝 Populate test DB
+
+You can create a test database using the API directly and some test files available on the repository.
+
+> 💬 *You can use directly the [documentation page](http://localhost/docs) to run the different commands.*
+
+Title | route | input path
+----- | ----- | ----------
+Create KEGG database | `/api/admin_db/create_kegg_ko` | no input file necessary, process is quick for all KEGG KO.
+NCBI taxonomy | `/api/admin_db/create_ncbi_taxonomy` | `https://gitlab.pasteur.fr/metagenomics/fastgenes/-/raw/25-gene-annotations/data_test/ncbi_taxonomy/taxdump.tar.gz?inline=false`
+NCBI taxonomy hierarchy | `/api/admin_db/generate_ncbi_taxonomy_hierarchy` | No file necessary, based on existing db
+Genes | `/api/admin_db/create_genes` | `https://gitlab.pasteur.fr/metagenomics/fastgenes/-/raw/25-gene-annotations/data_test/genes/genes.fa?inline=false`
+
+#### 💀 Deprecated way
+
+From `backend/app` directory:
+
+```bash
+poetry run create_test_db
+```