Give add contact feature please....

### Feature summary

Feature to add a specific contact to acc

### Ideal solution or implementation

```markdown
/addcontact/session
data
fname:
lname:
number:
```

### Alternatives / Additional context

_No response_

### Checklist

- [x] I have searched existing issues and confirmed this is not a duplicate.
- [x] This request is within the scope of WhatsApp Web capabilities.