Adds basic hunter signup endpoint

src/main/kotlin/net/halfbinary/scavengerhuntapi/service/SignupService.kt

@@ -0,0 +1,13 @@
+package net.halfbinary.scavengerhuntapi.service
+
+import net.halfbinary.scavengerhuntapi.model.converter.toRecord
+import net.halfbinary.scavengerhuntapi.model.domain.Hunter
+import net.halfbinary.scavengerhuntapi.repository.HunterRepository
+import org.springframework.stereotype.Service
+
+@Service
+class SignupService(private val hunterRepository: HunterRepository) {
+    fun createNewHunter(hunter: Hunter) {
+        hunterRepository.save(hunter.toRecord())
+    }
+}