Making the Title as required field in Document Library

Scenario:
Document Library has Name as the required field , whereas Title is not. Now you want to make the Title field as required in a Document Library.

Solution:
You can navigate to the Document Library Settings and enable it by managing content type.

Steps:
1. Go to Document Library Settings
2. Click on Advanced Settings
3. Select 'Yes' for the option 'Do you want to manage the content types ?' and Save
4. Click on 'Document' link under Content Types section
5. You will see all the column listed
6. Click on 'Title' and now you can make it required field.
7. Save the changes