Create a deposit smart contract

We are looking for someone to be able to do this Task here below:

Task ->

As ethereum is moving to proof of stake consensus mechanism. we would like you to create a deposit smart contract, where people can deposit X amount (configurable) of Ether.
Along with that find a optimal way to create json object necessary for making a deposit into smart contract.
json object should contain following fields. (it should follow the eth2.0 spec standard)

[
{
"pubkey": "",
"withdrawal_credentials": "",
"amount": 32000000000,
"signature": "",
"deposit_message_root": "",
"deposit_data_root": "",
"fork_version": "70000069",
"network_name": "kiln",
"deposit_cli_version": "2.0.0"
}
]