Added a testimonials content type and view

[amouer]

This is for the testimonials page. Created a view and a content type.

[ashabed]

@amouer This is headed in the right direction. A few things to change (in priority order):

1. The entity reference field is named 'field_entityref'. That's similar to naming the testimonials field 'field_longtext' - it needs to be more descriptive than that.
   The purpose of the entity reference field is it's an optional field for referencing user accounts. So a better label would be User account, and better machine name 'field_user_ref'.
2. The entity reference field has its 'Target type' set as 'Node'. We want its target type to be 'User', so that you can select a User in that field.
3. Feature name is currently 'testimonials'. It's better for our features to have names unique to our site. A label of Testimonials is good - but the 'machine name' (the name generated when you first create the feature, which is used for filenames), should be something like debug_a_testimonials.

The first 2 are required changes, the third is a 'nice to have'. As this task is due Sunday night, please ensure you get the first 2 corrected and updated in the pull request by Sunday night.