add README.md

Author: ginuerzh

README.md

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+# GOST-PLUS
+
+A cross-platform GUI client for [GOST.PLUS](https://gost.plus) built with [gioui](https://gioui.org).
+
+## Features
+
+### File Tunnel
+
+Expose local files to the public network.
+
+<img src="assets/file-tunnel.gif">
+
+### HTTP Tunnel
+
+Expose local HTTP service to the public network.
+
+<img src="assets/http-tunnel.gif">
+
+### TCP Tunnel
+
+Expose local TCP service to the public network.
+
+<img src="assets/tcp-tunnel.gif">
+
+### UDP Tunnel
+
+Expose local UDP service to the public network.
+
+<img src="assets/udp-tunnel.gif">
+
+## Screenshot
+
+### Desktop
+
+<img src="assets/list.png" width="512" />
+<img src="assets/menu.png" width="512" />
+<img src="assets/add.png" width="512" />
+<img src="assets/edit.png" width="512" />
+
+### Mobile
+
+<img src="assets/list-android.png" width="512" />
+<img src="assets/add-android.png" width="512" />
+<img src="assets/edit-android.png" width="512" />