Adds modrinth description.

Modrinth-Description.md

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+**MobScores**
+
+MobScores awards ScoreKeeper points for configured mob kills. Set a score for each supported entity type and let ScoreKeeper track the player's total by UUID.
+
+## Requirements
+
+- Paper 1.21.7 or a compatible newer server.
+- Java 25 or newer at runtime and for building.
+- ScoreKeeper 0.2.2 or a compatible release.
+
+Install ScoreKeeper and MobScores in the server's `plugins` directory. ScoreKeeper is a required dependency and must be enabled for MobScores to load.
+
+## Configuration
+
+MobScores creates `plugins/MobScores/config.yml` from its defaults. Edit `ScoreTable` to configure point values by Bukkit `EntityType` name:
+
+```yaml
+ScoreTable:
+  ZOMBIE: 25
+  CREEPER: 50
+  SILVERFISH: 0
+```
+
+Set an entity's value to `0` to disable its points and hide it from the join-time score table. Restart the server after changing the configuration.
+
+## Scoring
+
+MobScores records credit for configured entity types damaged directly by a player or by a projectile fired by a player. When a credited player remains online when the entity dies, its configured points are added to that player's active ScoreKeeper bucket. Other mob attribution is not currently handled.
+
+MobScores has no commands of its own. Players see the nonzero score table when they join.
+
+## Build
+
+Run `./gradlew test` and `./gradlew build` from the project root. See [CONTRIBUTING.md](CONTRIBUTING.md) for development and local Paper testing instructions.