Add English setup instructions to README

README

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-热敏小票打印机 CUPS 驱动（Linux）
-
-在 Gprinter GP1324D 上测试成功
-
-抄袭了 https://tifan.net/blog/2018/03/27/gprinter-thermal-printer-unix-driver/

README.md

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+# Linux CUPS Driver for Gprinter GP-1324D
+
+## Driver Setup Instructions
+
+1. Copy `rastertotspl` to `/usr/lib/cups/filter`
+2. Make `rastertotspl` executable and owned by root (`sudo chown root:root rastertotspl && sudo chmod 755 rastertotspl`)
+3. Edit `/usr/share/cups/usb/org.cups.usb-quirks` and add the text in this repository's `org.cups.usb-quirks` to the bottom.
+4. Plug in the printer with USB.
+5. Visit http://localhost:631, click Administration at the top, then click Add Printer.
+6. Enter your login username and password if prompted. If it doesn't work, add your user to the `lp` and `lpadmin` groups, reboot, and try again.
+7. Select the found printer in the list under Local Printers, fill in printer name and other info.
+8. When asked to choose the make and model, use the "Provide a PPD file" option and open `Gprinter.ppd` from this repository.
+
+# 热敏小票打印机 CUPS 驱动（Linux）
+
+在 Gprinter GP1324D 上测试成功
+
+抄袭了 https://tifan.net/blog/2018/03/27/gprinter-thermal-printer-unix-driver/