chore: update system requirements

Author: ArturWieczorek

Readme.md

@@ -63,6 +63,34 @@ on the same machine are:
 * 320 Gigabytes or more of disk storage (preferably SSD which are 2-5 times faster than
   electro-mechanical disks).
 
+
+### `mainnet`
+
+- `cardano-node` database: 203 GB
+- `cardano-db-sync` ledger state: ~ 10 GB
+- `Postgres` database `mainnet_13.6.0.5` total size: 438 GB
+
+- `cardano-db-sync` RSS RAM: peaks at 20.6 GB before settling at 18.5 GB
+
+
+### `preprod`
+
+- `cardano-node` database: 12 GB
+- `cardano-db-sync` ledger state: ~ 2 GB
+- `Postgres` database `preprod_13.6.0.5` total size: 16 GB
+
+- `cardano-db-sync` RSS RAM: 3,5 GB
+
+
+### `preview`
+
+- `cardano-node` database: 12 GB
+- `cardano-db-sync` ledger state: ~ 2 GB
+- `Postgres` database `preview_13.6.0.5` total size: 21 GB
+
+- `cardano-db-sync` RSS RAM: 3,5 GB
+
+
 The recommended configuration is to have the `db-sync` and the PostgreSQL server on the same
 machine. During syncing (getting historical data from the blockchain) there is a **HUGE** amount
 of data traffic between `db-sync` and the database. Traffic to a local database is significantly