add readme for power supply gui

diff --git a/powersupplies/web/README.txt b/powersupplies/web/README.txt
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+Supported Devices
+=================
+* Hameg / Rohde-Schwarz HMP, HMC  (Ethernet, RS232, USB)
+* Gw-Instek PSP (only with a non-standard USB-RS232 converter), PST
+* Korad / RND KA3000 (USB)
+* Custom power switch modules
+
+Start
+=====
+* Run ./httpi localhost 2222
+* Direct browser to http://localhost:2222
+
+
+Caveats
+=======
+* Mostly not multi-user proof
+* Not secure. Don't expose to the world, use in separated local network only.
+* Some serial devices might need some fine tuning of delays and wait times.
+
+
+Configuration File
+==================
+
+ PWRSPLY:/path/to/device:Speed_Port:Name:Type:Channels:Names
+
+/path/to/device
+ * IP192.168.0.0 (Ethernet)
+ * /dev/FTDI_FT232R_USB_UART_A702HE33  (serial devices)
+ * SERuser@192.168.0.0/dev/ttyUSB0  (serial devices on other computer)
+ 
+Speed_Port
+ * BAUD rate for serial devices
+ * Port number for Ethernet devices
+ 
+Name
+ * name of power supply in GUI
+ 
+Type
+ * Power supply series: HMP, HMC, PST, PSP, KA3000
+ * Custom modules: PWRSW
+ 
+Channels 
+ * Number of channels on device
+ 
+Names
+ * List of names for channels (separated by colon. keep short)
+ 
+ 
+USB Devices
+==============
+Configure USB system to create fixed names for devices and set permissions:
+ 
+/etc/udev/rules.d/99-serial-permission.rules 
+ SUBSYSTEMS=="usb", ATTRS{idVendor}=="10c4", SYMLINK+="$env{ID_SERIAL}", \ 
+ GROUP="users", MODE="0666", TEST=="power/control", ATTR{power/control}="on"
+