Problem: minimum gas prices not put by default

Solution: (Fix crypto-org-chain#21) Add instructions to update the minimum gas prices

docs/getting-started/croeseid-testnet.md

@@ -66,6 +66,12 @@ Before kick-starting your node, we will have to configure your node so that it c
   OK!
   ```
 
+- For Cosmos configuration, in `~/.chain-maind/config/app.toml`, update minimum gas price to avoid [transaction spamming](https://github.com/cosmos/cosmos-sdk/issues/4527)
+
+  ```bash
+  $ sed -i.bak -E 's#^(minimum-gas-prices[[:space:]]+=[[:space:]]+)""$#\1"0.025basetcro"#' ~/.chain-maind/config/app.toml
+  ```
+
 - For network configuration, in `~/.chain-maind/config/config.toml`, please modify the configurations of `seeds` and `create_empty_blocks_interval` by:
 
   ```bash