add a validator into the created subnet

add_validator_subnet.sh

curl -X POST --data '{
    "jsonrpc": "2.0",
    "method": "platform.addSubnetValidator",
    "params": {
        "nodeID":"NodeID-EggGmnQFaTffeRNG1Kzs9dXJzFGdxac3D",
        "subnetID":"2bFRwRRTmvn64z7LuDq4bzLqfjTtFan8GDiMqk6eok85JG8gvK",
        "startTime":'$(date --date="10 minutes" +%s)',
        "endTime":'$(date --date="30 days" +%s)',
        "weight":100,
        "changeAddr": "P-fuji1s3056zrcm36y0pzx5d3g9p5quavvpxk2yhssvp",
        "username": "testuser_jp01",
        "password": "<your user password>"
    },
    "id": 1
}' -H 'content-type:application/json;' 127.0.0.1:9650/ext/P
{"jsonrpc":"2.0","result":{"txID":"2PieJ6vFtu1Q3RpRfE1EoM3NRhrRJpAQbjKi3NQETyeiHqerEk","changeAddr":"P-fuji1s3056zrcm36y0pzx5d3g9p5quavvpxk2yhssvp"},"id":1}