update README

README.md

@@ -1,6 +1,23 @@
-shadowsocks-csharp
-===========
+Shadowsocks for Windows
+=======================
 
-This is C# version of shadowsocks.
+### Features
+
+1. Native Windows UI
+2. Fast system proxy switching
+3. Compatible with IE
+4. Builtin PAC server with user editable PAC
+5. QRCode generation
+6. Only a single exe file of 200KB size
+
+### Usage
+
+1. Find Shadowsocks icon in notification tray
+2. You can add multiple servers in servers menu
+3. After you saved PAC file with any editor, Shadowsocks will notify browsers
+about the change automatically
+4. Please disable other proxy addons in your browser, or set them to use
+system proxy
+5. You may need to install VC runtime and .Net 2.0 if Shadowsocks failed to
+start
 
-In progress.