feat: added network fees to readme

README.md

@@ -48,6 +48,63 @@ npx -p @govtechsg/open-attestation-cli open-attestation <arguments>
 
 ## Usage
 
+### Network Fees
+
+For information on how network fees work, please refer to the ethereum documentation: [https://ethereum.org/en/developers/docs/gas/](https://ethereum.org/en/developers/docs/gas/)
+
+#### Adjusting preset gas price
+
+To adjust transaction gas price, use the variable of `priority` to scale against the market price.
+
+Calculation:
+priority \* previous block priority fee
+
+Example:
+
+| Priority | Previous block priority fee | Priority Fee to use |
+| -------- | --------------------------- | ------------------- |
+| 1        | 1                           | 1 \* 1 = 1          |
+| 1.2      | 1                           | 1.2 \* 1 = 1.2      |
+| 2        | 1                           | 2 \* 1 = 2          |
+| 1        | 10                          | 1 \* 10 = 10        |
+| 1.2      | 10                          | 1.2 \* 10 = 12      |
+| 2        | 10                          | 2 \* 10 = 20        |
+
+#### Fee Information
+
+To display an estimated price of a transaction use the option of `dry-run` on your command.
+
+Example:
+
+```bash
+open-attestation deploy document-store "My Name" --network sepolia --dry-run
+
+/!\ Welcome to the fee table. Please read the information below to understand the transaction fee
+
+The table below display information about the cost of the transaction on the mainnet network, depending on the gas price selected. Multiple modes are displayed to help you better help you to choose a gas price depending on your needs:
+
+Information about the network:
+Costs based on block number: 4275264
+┌─────────┬──────────────┬──────────────────┬─────────────────────────────────┬────────────────────────┐
+│ (index) │ block number │ gas price (gwei) │ max priority fee per gas (gwei) │ max fee per gas (gwei) │
+├─────────┼──────────────┼──────────────────┼─────────────────────────────────┼────────────────────────┤
+│ current │   4275264    │  '0.629067134'   │              '2.5'              │     '3.758131382'      │
+└─────────┴──────────────┴──────────────────┴─────────────────────────────────┴────────────────────────┘
+Information about the transaction:
+Estimated gas required: 869810 gas, which will cost approximately US$0.86837 based on prevailing gas price.
+┌──────────┬───────────────────────┬────────────────────┬───────────────────────┐
+│ (index)  │       gas cost        │ priority fee price │     max fee price     │
+├──────────┼───────────────────────┼────────────────────┼───────────────────────┤
+│   GWEI   │   '547168.88382454'   │    '2174525.0'     │  '3268860.25737742'   │
+│   ETH    │ '0.00054716888382454' │   '0.002174525'    │ '0.00326886025737742' │
+│  ETHUSD  │        0.86837        │      3.45105       │        5.18781        │
+│  ETHSGD  │        1.18247        │      4.69931       │        7.06426        │
+│ MATICUSD │        0.00027        │      0.00109       │        0.00165        │
+│ MATICSGD │        0.00037        │      0.00149       │        0.00225        │
+└──────────┴───────────────────────┴────────────────────┴───────────────────────┘
+Please read the information above to understand the table
+```
+
 #### List of features with the required options
 
 |                                                                            | Private Key | Wallet | Aws Kms |
@@ -694,6 +751,7 @@ Example - with private key set in `OA_PRIVATE_KEY` environment variable (recomme
 open-attestation title-escrow accept-surrendered --token-registry 0x4933e30eF8A083f49d14759b2eafC94E56F0b3A7 --tokenId 0x951b39bcaddc0e8882883db48ca258ca35ccb01fee328355f0dfda1ff9be9990 --network sepolia
 
 ✔  success   Surrendered transferable record with hash 0x951b39bcaddc0e8882883db48ca258ca35ccb01fee328355f0dfda1ff9be9990 has been accepted.
+
 ```
 
 ## Help