This song is available for free with Chromatik.
Looking for the lyre chords of Ed Sheeran's track "Thinking Out Loud"?
You won't find too many websites offering lyre chords only, however you can easily learn to play the song Thinking Out loud by using the piano sheet music.
http://www.everyonepiano.com/Stave-4455-1-Thinking-Out-Loud-Ed-Sheeran-Stave-Preview-1.html
I would also recommend coupling this process with watching youtube videos of people playing this song on piano or keyboard, as it will help you determine which chords/notes are the important ones to hit.
Playing the lyre usually involves turning entire chords into single notes. So a C chord becomes C note (played in the correct key).
Take a look at this video for inspiration and help learning to play Thinking Out Loud on your lyre.
Also why not post a video of your own so we can all enjoy your rendition once you've mastered the song?