Readme instruction for "Sign the PSBT with sparrow, hal, or bdk-cli."

[avlo]

the Readme file instruction for:

Sign the PSBT with sparrow, hal, or bdk-cli. (near the bottom of section Sign psbt and broadcast it)

does not have a/any sample instructions for how to sign (using either sparrow, hal or bdk-cli).

please include an example in the Readme (preferably using hal or bdk-cli) for how to do so.

---

if helpful, below attempt using hal yielded following result:

$ hal psbt finalize --regtest alice.psbt
failed to finalize psbt: Could not satisfy Tr descriptor at index 0

with hal version:

$ hal -V
hal 0.9.5

below is the alice.psbt verification

$ hal psbt decode --regtest alice.psbt
{
  "unsigned_tx": {
    "txid": "a5dfa897c6f6addb2acb6f39188af8374ff3d1b837cb4466c794eaad764acb91",
    "wtxid": "a5dfa897c6f6addb2acb6f39188af8374ff3d1b837cb4466c794eaad764acb91",
    "size": 94,
    "weight": 376,
    "vsize": 94,
    "version": 2,
    "locktime": 0,
    "inputs": [
      {
        "prevout": "ffac0e13d722682e3fc87fa0521d3349663144205644f8b70c5d9013d8afac14:1",
        "txid": "ffac0e13d722682e3fc87fa0521d3349663144205644f8b70c5d9013d8afac14",
        "vout": 1,
        "script_sig": {
          "hex": "",
          "asm": ""
        },
        "sequence": 0,
        "witness": null
      }
    ],
    "outputs": [
      {
        "value": 99999600,
        "script_pub_key": {
          "hex": "5120a765f094379b7d6dde78f419bf943498ed645beb6a5554e5994174736436cba7",
          "asm": "OP_PUSHNUM_1 OP_PUSHBYTES_32 a765f094379b7d6dde78f419bf943498ed645beb6a5554e5994174736436cba7",
          "type": "unknown",
          "address": "bcrt1p5ajlp9phnd7kmhnc7svml9p5nrkkgkltdf24feveg968xepkewnsl0dgjt"
        }
      }
    ],
    "total_output_value": 99999600
  },
  "inputs": [
    {
      "witness_utxo": {
        "value": 100000000,
        "script_pub_key": {
          "hex": "51201c47c0efac3f7dd679a0491849f14eb3d5f6f1089dcbf9d66d164bd0338c2923",
          "asm": "OP_PUSHNUM_1 OP_PUSHBYTES_32 1c47c0efac3f7dd679a0491849f14eb3d5f6f1089dcbf9d66d164bd0338c2923",
          "type": "unknown",
          "address": "bcrt1pr3rupmav8a7av7dqfyvynu2wk02lduggnh9ln4ndze9aqvuv9y3sklwrss"
        }
      }
    }
  ],
  "outputs": [
    {}
  ]
}

[bitlightlabs-dev]

$ bdk-cli -n regtest wallet --descriptor "tr(tprv8ZgxMBicQKsPeHzjP5LTL818LxwHbJNLZRa98Qdnn7M98fW15365cB1Sz9QZvYufASRKH6JEPhfpxVuFTKMHxDcEAVboqKuZdMmxzKVhMnW/86'/1'/0'/0/*)" \ 
sign --psbt $(cat alice.psbt | base64 | tr -d '\r\n') | jq -r '.psbt' | base64 --decode > alice.psbt.signed

$ hal psbt finalize alice.psbt.signed
0200000000010184cc73022f7b19317eb3490f10ef7f0...27921857420c21461a205c5b60ca54c00000000