Similarweb rank badge

### 📋 Description

this badge could be used in github repos or directly on the website

data for youtube.com would be `Website rank | 2#`

### 🔗 Data

there are official api and require an access token

API documentation: https://developers.similarweb.com/docs/digital-rank-api

### 🎤 Motivation

could be useful for those who develop a website and want to show its position

Start with the Similarweb Digital Rank API documentation linked in the issue and determine the authentication, request, and response requirements. Clarify how a domain such as youtube.com should be supplied and how its returned rank should appear as a badge; done means the badge works with the required token and produces the requested rank output.

Written by the indexing model from the issue text.