I could build such an Electron app for you, but I have a few questions.
Do you want to scan a directory with just Steam games? Otherwise, where should game thumbnails and titles come from?
Relevant Skills and Experience
I have several years of experience building small- to medium-scale web apps. Considering Electron app is just a web app packed with a browser, I'm sure, I can build one.
Proposed Milestones
$200 USD - Fully working application
Do you have a design ready for the app? Or maybe you've chosen a HTML template for it?