Update README.md

Author: pbzweihander

README.md

@@ -7,14 +7,58 @@ Inspired by [b1naryth1ef/sneaker](https://github.com/b1naryth1ef/sneaker).
 The name `peace-eye` is derived from [Korean version of Boeing 737 AEW&C "Peace Eye"](https://en.wikipedia.org/wiki/Boeing_737_AEW%26C).
 Powered by [tauri](https://tauri.app/).
 
-## Prerequisites
+## Usage
+
+> Server should support Tacview realtime telemetry!
+
+Download the latest release in [Release page](https://github.com/pbzweihander/peace-eye/releases/latest) and install it.
+
+![guide screenshot 1](./guide-screenshot1.png)
+
+Enter the server's domain or IP in `Host` input.
+For example, `dcs.hoggitworld.com` for hoggit GAW.
+
+Enter the Tacview realtime telemetry server's port number in `Port` input.
+If you are not sure, just don't touch it.
+
+You can enter anything you like in `Username` input.
+It is not relevant.
+
+If your server has password for Tacview realtime telemetry server (not DCS server!), enter it in `Password` input.
+For example, hoggit GAW has same DCS server password for Tacview realtime telemetry server. (Which I'm not gonna write it here.)
+
+And press `CONNECT` button.
+
+![screenshot](./screenshot.png)
+
+After waiting some seconds, you can see above screen.
+If you are not, check `Host`, `Port`, and `Password` was correct.
+
+This is your main screen.
+Various options can be set or unset in settings menu, located on top right cogwheel button.
+
+### Features
+
+- Drag with left click to pan the view.
+- Drag with right click to measure bearing and range.
+- On the right bottom screen, you can see the bullseye of the cursor location.
+  - In settings menu, you can choose to see coordinates of the cursor location.
+- In bottom right of each object, you can see altitude (in thousands of feets), estimated ground speed (in knots), estimated altitude rate (in thousands of feets per minutes).
+- Click the object to see various information of the object.
+  - In object information, you can press `CENTER` button to center the view to the object.
+  - You can set warning radius, and thread radius, which represented in yellow and red circle.
+  - You can set the object to `Watch` state. Watched objects can be quick-accessed in the top right `WATCHES` button on screen.
+- Search the object with name via `SEARCH` button on the top right button on screen.
+
+## Development
+
+### Prerequisites
 
-- Server should support Tacview realtime telemetry
 - [Tauri Prerequisites](https://tauri.app/v1/guides/getting-started/prerequisites)
 - [Rust](https://www.rust-lang.org/)
 - [Node](https://nodejs.org/en/)
 
-## Usage
+### Running in development mode
 
 ```
 yarn tauri dev