You can do this many ways. One way to add it to your photos is to download a felt texture image if you don't want to make your own.Grey Seamless Felt Texture
Then put that on a layer above your image and set the blend mode of that layer to Overlay. The example I provided will make the image dark and add the texture. But if you lighten that texture image, it will also lighten the appearance over the image.
If you have a sample of felt at home, shoot a pic with your camera, or phone, and convert it to grayscale (Image > Adjustments > Desaturate) and then put it on top of your photograph and set the blend mode to overlay. Again, lighten or darkening the tone of the texture layer will affect the appearance in different ways.https://digital-photography-school.com/add-texture-overlay-images-stunning-effect/
This tutorial has a similar instruction for reference
How to Add a Texture Overlay to Your Images for a Stunning Effect
Hope that helps.