feat: add exp command

Author: Boy0000

src/main/kotlin/com/mineinabyss/extracommands/ExtraBrigadierCommands.kt

@@ -23,6 +23,7 @@ object ExtraBrigadierCommands {
             vanishCommand()
             viewDistanceCommands()
             nightVisionCommand()
+            expCommand()
             mineInAbyssCommands()
         }
     }

src/main/kotlin/com/mineinabyss/extracommands/commands/ExpCommand.kt

@@ -0,0 +1,28 @@
+package com.mineinabyss.extracommands.commands
+
+import ca.spottedleaf.moonrise.common.util.MoonriseConstants
+import com.mineinabyss.idofront.commands.brigadier.RootIdoCommands
+import com.mineinabyss.idofront.commands.brigadier.executes
+import com.mineinabyss.idofront.messaging.error
+import com.mojang.brigadier.arguments.IntegerArgumentType
+import com.mojang.brigadier.arguments.StringArgumentType
+import io.papermc.paper.command.brigadier.argument.ArgumentTypes
+import io.papermc.paper.command.brigadier.argument.resolvers.selector.PlayerSelectorArgumentResolver
+
+fun RootIdoCommands.expCommand() {
+    "exp" {
+        "add" {
+            executes(
+                ArgumentTypes.players().named("players").resolve(),
+                IntegerArgumentType.integer().named("amount").default { 0 },
+                StringArgumentType.word().named("type").default { "points" }.suggests { suggest(listOf("levels", "points")) }
+            ) { players, amount, type ->
+                when (type) {
+                    "levels" -> players.forEach { player -> player.giveExpLevels(amount) }
+                    "points" -> players.forEach { player -> player.giveExp(amount) }
+                    else -> sender.error("Invalid type $type, must be levels or points..")
+                }
+            }
+        }
+    }
+}