Add models for game, cache and settings.

models/metric_setting.go

@@ -0,0 +1,9 @@
+package models
+
+type MetricSetting struct {
+	ID             uint    `json:"id" gorm:"primary_key"`
+	Name           string  `json:"name" binding:"required"`
+	WeaponCategory string  `json:"weapon_category" binding:"required"`
+	Value          float64 `json:"value" binding:"required"`
+	Game           string  `json:"game" binding:"required"`
+}