updated database installation script and README

Merge branch 'develop'

database/README.md

@@ -15,6 +15,7 @@ Providing database schema and scripts for MyEMS.
 
 Execute the following scripts in MySQL commandline, or execute in other MySQL client tools such as MySQL Workbench, Navicat, DBaver, phpMyAdmin, etc.
 ```bash
+cd myems/database/install
 mysql -u root -p < myems_billing_baseline_db.sql
 mysql -u root -p < myems_billing_db.sql
 mysql -u root -p < myems_energy_baseline_db.sql
@@ -27,7 +28,8 @@ mysql -u root -p < myems_user_db.sql
 ```
 To insert demo data execute the following scripts,
 ```bash
-mysql -u root -p < demo/myems_system_db.sql
+cd myems/database/demo
+mysql -u root -p < myems_system_db.sql
 ```
 #### Change COLLATE for MySQL server before version 8.0
 ```bash