add language api docs

models/language.go

@@ -0,0 +1,15 @@
+package models
+
+import (
+	"gorm.io/gorm"
+)
+
+type LanguageRequest struct {
+	Code string `gorm:"uniqueIndex;size:5;not null" json:"code" binding:"required"`
+	Name string `gorm:"not null" json:"name" binding:"required"`
+}
+
+type Language struct {
+	gorm.Model
+	LanguageRequest
+}