Implements Hunt basic create and get, and adds field validation to controllers

src/main/kotlin/net/halfbinary/scavengerhuntapi/model/response/HuntResponse.kt

@@ -0,0 +1,12 @@
+package net.halfbinary.scavengerhuntapi.model.response
+
+import net.halfbinary.scavengerhuntapi.model.HuntId
+import java.time.LocalDateTime
+
+data class HuntResponse(
+    val id: HuntId,
+    val title: String,
+    val startDateTime: LocalDateTime,
+    val endDateTime: LocalDateTime,
+    val isTerminated: Boolean
+)