Adding models, DB access, signup, login

* Created Base, Auth, User and Admin models
* Added skeleton API structure containing: User signup, User & Admin
login, authorized zones, ping tests
* Simple user signup functional
* Skeleton user login functional, no means to verify as of yet
* Added POSTMAN file

models/base.go

@@ -0,0 +1,31 @@
+package models
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+type Base struct {
+	Uid     uuid.UUID `gorm:"type:uuid;primary_key;"`
+	Created time.Time
+	Updated time.Time
+	Deleted time.Time `sql:"index"`
+	Tenant  uuid.UUID
+}
+
+func (b *Base) BeforeCreate(scope *gorm.DB) error {
+	b.Uid = uuid.New()
+	b.Created = time.Now()
+	return nil
+}
+
+func (b *Base) BeforeSave(tx *gorm.DB) error {
+	b.Updated = time.Now()
+	return nil
+}
+
+func (b *Base) Delete() {
+	b.Deleted = time.Now()
+}