The Sony A7r is shown as supported since LR 5.3 / ACR 8.3 see the link below.
The latest version is LR 5.7 and the update was released earlier today.
What do you mean "not shown in devices"?
Your second reply came through blank, not sure if you're using email for response or the web client.
See if these resources help with importing from Camera, Card reader, or from folder on desktop or other local location:
- Lightroom Help | Import photos from a camera or card reader
- Lightroom 5 - Importing Your Images | Getting Started with Adobe Photoshop Lightroom 5 | Adobe TV
Let us know more details if you still have trouble.