kind 0のcontentのプロパティの出現頻度をしらべた

サンプルは relay-jp.nostr.wirednet.jp より取得

```

got 498 events

name: 491

display_name: 474

about: 469

picture: 445

nip05: 359

lud06: 302

website: 426

banner: 314

lud16: 231

nip05valid: 120

created_at: 41

username: 107

displayName: 108

identities: 12

followingCount: 3

followersCount: 2

nip05_updated_at: 1

zapService: 10

webOfTrustScore: 1

badges: 1

nip5: 1

Blog site:: 1

Twitter: 3

Mastodon (social.vivaldi.net): 1

deleted: 5

nostr.directory: 1

activitypub: 1

github:mattn: 1

nip-05: 1

iris: 1

mastodon: 1

misskey: 1

GitHub: 2

Misskey/ActivityPub: 1

lit.link: 1

```