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

database/database.go

@@ -0,0 +1,58 @@
+package database
+
+import (
+	"time"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+)
+
+type Database struct {
+	*gorm.DB
+}
+
+var Db *gorm.DB
+
+func Init() *gorm.DB {
+	db, err := gorm.Open(sqlite.Open("prepack.db"), &gorm.Config{})
+	if err != nil {
+		panic(err)
+	}
+
+	//TODO GORM settings
+	database, err := db.DB()
+	if err != nil {
+		panic(err)
+	}
+
+	database.SetMaxIdleConns(10)
+	database.SetMaxOpenConns(50)
+	database.SetConnMaxLifetime(time.Minute * 30)
+
+	Db = db
+	return db
+}
+
+func InitTestDb() *gorm.DB {
+	db, err := gorm.Open(sqlite.Open("test_prepack.db"), &gorm.Config{})
+	if err != nil {
+		panic(err)
+	}
+
+	//TODO GORM settings
+	database, err := db.DB()
+	if err != nil {
+		panic(err)
+	}
+
+	database.SetMaxIdleConns(10)
+	database.SetMaxOpenConns(50)
+	database.SetConnMaxLifetime(time.Minute * 30)
+
+	Db = db
+	return db
+}
+
+func GetDb() *gorm.DB {
+	return Db
+}