[docs] guide: document current Looking Glass features

README.md

@@ -1,12 +1,27 @@
 # Looking Glass
 
-An extremely low latency KVMFR (KVM FrameRelay) implementation for guests with
-VGA PCI Passthrough.
+Looking Glass lets you use a Windows virtual machine from Linux with very low
+display and input latency. The current recommended setup uses the Looking Glass
+Indirect Display Driver (IDD) in the Windows guest and the Looking Glass Client
+on the Linux host.
 
 * Project Website: https://looking-glass.io
 * Documentation: https://looking-glass.io/docs
 
-## Documentation
+## Start here
+
+The Linux client is currently distributed as source code and must be built
+before it can be installed. The end-user guide covers the complete process:
+
+1. Build the Linux client.
+2. Configure shared memory for the virtual machine.
+3. Install the Looking Glass IDD in Windows.
+4. Install and run the client.
+
+See the [Looking Glass documentation](https://looking-glass.io/docs) for the
+current requirements and setup guide.
+
+## Source archives
 
 ❕❕❕ **IMPORTANT** ❕❕❕
 
@@ -16,7 +31,7 @@ Glass, please download the source archive from the website instead:
 
 https://looking-glass.io/downloads
 
-Source code for the documentation can be found in the `/doc` directory.
+Source code for the documentation can be found in the `doc` directory.
 
 You may view this locally as HTML by running `make html` with `python3-sphinx`
 and `python3-sphinx-rtd-theme` installed.