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Open After Effects and create a new composition by selecting
 

 Composition >

New Composition 

Choose UHD 4K 23.976 but match the aspect ratio of the editing project you are working on

For HD Projects choose 1920 x 1080 square pixels at the correct frame rate
23.976 or 29.97 as shown here.

Go ton >Compostition>Composition Settings>

Look at the background color>make sure it is black

For example if the credits are over black then the AE background color should be black as well.

Import the photoshop file of the credits to after effects

> twirl down the arrow next to the composition> twirl down the arrow next to the Transform option to reveal the sub menus including Position.

To begin the credit roll - The position of the text must placed all the way down out of the composition window. This will start the credits off screen in the beginning then roll upwards displaying the text rolling by.
 
To achieve this change the numerical value of the right most # of the position
indicator in Effect Controls.

By holding down the SHIFT key and dragging the mouse pointer over the # upwards to increase the numerical amount higher. The text will roll downward in the composition window.

Continue to increase the # until the text until it is barely out of screen.

To set the last keyframe, click in the composition timeline and then press the END key on the keyboard. This will take you to the end of your comp.

Change the numerical value of the right most # of the position indicator in Effect
Controls. By holding down the SHIFT key and dragging the mouse pointer over
the # downwards to decrease the numerical amount negatively. The text
will roll upwards in the composition window. Continue to decrease the # until
the text until it is barely out of screen.

If you want the credits to fill the screen

Scale up to 177 or so from 100

The second keyframe at the end of the timeline should appear after you change the position value.

Scroll through the timeline to see if the roll effect is working.

To customize the time of the credit roll

Place your timeline indicator
at the second mark that equals how long you want your credits to roll
Ex: 19 sec shown here  

Then change that to be your end keyframe

Can move your work area end marker to 

the 19 second mark to end your timeline earlier

If all looks good render the project.

Click in the composition timeline that you just created and click
Composition > Add to Render Queue

The Render Queue opens.

First, click on the words Best Settings to change the
parameters of the Render Settings

Next click on the words Lossless to change the parameters of the Output Module

Choose DNxHR/DNxHD

8Bit

Click OK

Back in the Render Queue click on the blue text next to Output To your chosen destination for the file

Click Render to begin Rendering. 

Once the quicktime is made import the file into NLE or AVID.