Update README.md

diff --git a/README.md b/README.md
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@@ -4,6 +4,8 @@ A third-party pan/tilt controller software for Logicool webcam.
 
 You can control pan/tilt, white balance, and exposure.
 
+![screenshot](https://github.com/hylom/orbitcapture/blob/master/doc/screenshot.png "screenshot")
+
 ## Supported platform
 
 * macOS 10.12 or above.
@@ -16,5 +18,8 @@ You can control pan/tilt, white balance, and exposure.
 
 Select webcam from devie list, and click "Connect" button.
 
+![select device](https://github.com/hylom/orbitcapture/blob/master/doc/select_device.png "select device")
+
+
 ## License
 MIT License.