add rbac + db-create script

src/models/rolePermissionsModel.js

@@ -0,0 +1,19 @@
+const { DataTypes } = require('sequelize');
+
+module.exports = (sequelize) => {
+  const RolePermissions = sequelize.define('RolePermissions', {
+    Role_ID: {
+      type: DataTypes.INTEGER,
+      primaryKey: true
+    },
+    Permission_ID: {
+      type: DataTypes.INTEGER,
+      primaryKey: true
+    }
+  }, {
+    tableName: 'RolePermissions',
+    timestamps: false
+  });
+
+  return RolePermissions;
+};