feat: update README.md

README.md

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 A simple cross-platform crypto monitor that monitors the price of crypto currencies.
 
+![Crypto Monitor](./imgs/crypto-monitor.png)
+
 *This project is under development.*
+
+## Features
+
+- Cross-platform: Windows, macOS, Linux
+- Real-time crypto price monitoring
+- Obtain crypto price data from OKX(currently!)
+
+## Usage
+
+1. Download the latest release from the [Releases](https://github.com/shiquda/crypto-monitor/releases) page.
+2. There are four buttons on the top:
+    - `+`: Edit the crypto currency to monitor
+    - `-`: Minimize the window
+    - `📍`: Keep the window on top
+    - `❌`: Close the window
+3. Double click the crypto currency item to open the *okx* page of the crypto currency in your default browser.
+
+## TODO
+
+- [ ] Settings page
+- [ ] More price data sources, e.g. Binance
+
+## Credits
+
+- [wails](https://wails.io/)
+- [go-okx](https://github.com/iaping/go-okx)