Update README.md

geth_and_k8s/README.md

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 * a custom `NetworkID` , which we set `137`
 
 
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 ### Gas
 
 Gas refers to the unit that measures the computational effort required to execute specific operations on the Ethereum network.
 
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 ### Nodes
 
 Running nodes are responsible for the following tasks:
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 - participates in block validation (verifying blocks and states),
 - serve the network and provides data on request.
 
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 ### Storage
 
 More details to be added soon.
 
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 ### Faucet
 
 More details to be added soon.
 
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 ---
 
 ## Interacting with the client
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 You can run commands directly in the console:
 
 
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 ##### Getting total coinbase
 
 ```
 > web3.fromWei(eth.getBalance(eth.coinbase), "ether")
 ```
 
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 ##### Getting a balance from an account
 
 ```
 > web3.fromWei(eth.getBalance("2ee8D80de1c389f1254e94bc44D2d1Bc391eD402"), "ether")
 ```
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 #### txpool API
 
 Access to several non-standard RPC methods to inspect the contents of the transaction pool containing all the currently pending transactions as well as the ones queued for future processing:
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 txpool
 ```
 
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 #### Other useful checks
 
 ```
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 ```
 
 
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 ### Setting this chain on MetaMask
 
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 Chain ID: 137
 ```
 
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 ---
 
 ## References