Added instructions for nexus-e repo

docs/source/faq.md

+### **Common issues**
+
+#### Database
+##### Grant full privileges to a user in MySQL Workbench
+![](images/mysql-user-privileges.png)
+![](images/mysql-user-privileges-2.png)
+
+##### Access denied to access database
+- In Matlab, print out the variables `connInfo.user`, `connInfo.pw`, and `connInfo.host` to make sure that they are exactly what you provided in the your `UserDBInfo` file.
+- Make sure you database user account has [full permission to the database](#grant-full-privileges-to-a-user-in-mysql-workbench)
+
+##### Database server timezone issue
+- Open command prompt and login to mysql using the command:  
+`mysql -u root -p`
+- Enter your MySQl password for the root user, this should start mysql and you should see the prompt `mysql>`
+- Type the following two command to reset the MySQL time zone:  
+`SET @@global.time_zone = 'Europe/Paris';`  
+`SET @@session.time_zone = 'Europe/Paris';`  
+    - If you get the error "Unknown or incorrect time zone: 'XXX'", use the command ([ref](https://dba.stackexchange.com/questions/120945/how-do-i-resolve-this-error-error-1298-hy000-unknown-or-incorrect-time-zone)):  
+    `mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root mysql –p`  
+    Then rerun the `SET @@...` commands.
+- You can check that these were properly set using the command:  
+`SELECT @@global.time_zone, @@session.time_zone;`
+- After confirming these are now correct you can exit mysql using the command:  
+`exit`
+
+##### Database definer missing
+Add a dummy user (same name as the missing definer - you can see it from the error message) to the database and [grant all previleges](#grant-full-privileges-to-a-user-in-mysql-workbench) .
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