Update the examples README index

[ahfoysal]

Updates examples/README.md so it lists the newer examples too, including the credential, audio, Python SDK, TypeScript, browser, and standalone demos.

Closes #124.

Checked that every local README link resolves and all runnable example files are linked.

[github-actions]

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[codecov]

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✅ All modified and coverable lines are covered by tests.

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[github-actions]

Vouch Verified Contributor ✨

Thank you @ahfoysal. This merged pull request earns a signed
Vouch Verified Contributor certificate, chained to the project root authority.

Your certificate (download and share it): https://vouch-protocol.com/c/ahfoysal/283

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Your Verifiable Credential (eddsa-jcs-2022)

{
  "@context": [
    "https://www.w3.org/ns/credentials/v2",
    "https://vouch-protocol.com/contexts/v1"
  ],
  "id": "urn:uuid:caaf3d4d-27df-4629-9195-4e26d4efee9b",
  "type": [
    "VerifiableCredential",
    "VouchCredential"
  ],
  "issuer": "did:web:vouch-protocol.com:contributors",
  "validFrom": "2026-07-05T20:13:21Z",
  "validUntil": "2126-06-11T20:13:21Z",
  "credentialSubject": {
    "id": "did:web:vouch-protocol.com:contributors",
    "vouchVersion": "1.0",
    "intent": {
      "action": "attest",
      "target": "github:ahfoysal",
      "resource": "https://github.com/vouch-protocol/vouch/pull/283",
      "role": "verified-contributor",
      "repository": "vouch-protocol/vouch",
      "pullRequest": 283
    },
    "delegationChain": [
      {
        "issuer": "did:web:vouch-protocol.com",
        "subject": "did:web:vouch-protocol.com:contributors",
        "intent": {
          "action": "attest",
          "target": "github:ahfoysal",
          "resource": "https://github.com/vouch-protocol/vouch/pull/283",
          "role": "verified-contributor",
          "repository": "vouch-protocol/vouch",
          "pullRequest": 283
        },
        "validFrom": "2026-06-19T04:45:43Z",
        "validUntil": "2036-06-16T04:45:43Z",
        "parentProofValue": "z5g1N4udQdy5asdxnV3qFhApB5cAh28DkMqHjEUSNG6cc8hrDDsxWyVbgn1XXUFR"
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  "proof": {
    "type": "DataIntegrityProof",
    "cryptosuite": "eddsa-jcs-2022",
    "created": "2026-07-05T20:13:21Z",
    "verificationMethod": "did:web:vouch-protocol.com:contributors#key-1",
    "proofPurpose": "assertionMethod",
    "proofValue": "z4QBPSu7nngCAVU6nqJvEuRzUhrsWjDjsvPJQrdRREeC9vhXFrUF5YPoUhPCaZjGpFSrYqJvbLKoEW2F9Rx6eySof"
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}