Update README.md

Author: alexsee

README.md

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-# Simple Screen Recorder
+# Lecture Screen Recorder
 
-A simple screen recorder using both the Windows.Graphics.Capture and Windows.Media.Transcoding APIs.
+This is a simple lecture screen recording tool with the capability of recording the webcam and the screen at the same time in full resolution. Additionally, it integrated into Powerpoint to store slide transition markers for later editing. The recorder is a UWP app with an App Service for the integration.
+
+## Features
+* Screen recording in full resolution (up to 4K)
+* Webcam recording in full resollution (up to 1080p)
+* Powerpoint integration for chapter markers
+* Various settings for webcam and screen recording (white balance, exposure, etc.)
+* Audio volume meter