Resolve "Missing documentation" (nodes/duniter-squid!6)

* doc: describe GENESIS_FILE and HISTORY_FILE

docker-compose.yml

@@ -24,8 +24,14 @@ services:
       - DB_HOST=db
       - DB_PASS=${DB_PASSWORD}
       - RPC_ENDPOINT=${RPC_ENDPOINT}
+
+      # `gdev.json` file for GDev, can be found on Duniter release pages, e.g.: https://git.duniter.org/nodes/rust/duniter-v2s/-/releases/runtime-800
       - GENESIS_FILE=${GENESIS_FILE}
+
+      # HISTORY_FILE is obtained with `cat g1-data.json | jq ".transactions_history" > transactions_history.json`
+      # `g1-data.json` can be found on Duniter release pages, e.g.: https://git.duniter.org/nodes/rust/duniter-v2s/-/releases/runtime-800
       - HISTORY_FILE=${HISTORY_FILE}
+
       # ports:
       # prometheus metrics exposed at port 3000
       # - "3000:3000"