added isSkill condition authored by Lxlp's avatar Lxlp
## Description
Checks a scoreboard value of the target entity.
## Attributes
| Attribute | Aliases | Description | Default |
|-----------|-----------|----------------------------------------------------------------------|---------|
| objective | obj, o | The objective | |
| entry | ent, e | The entry | |
| value | val, v | The value to match | |
## Examples
```yaml
Conditions:
- score{o=PlayerKills;e=Akim91;v=10} true
```
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