feat: update readme

README.md

@@ -1,7 +1,28 @@
 # secure-editor-rs
 
-Secure Editor Rust edition
+Secure Editor written in Rust Programming Language.
 
+## Preparation
+
+```shell
+cargo install create-tauri-app --locked
+```
+
+## Build
+
+### Development Build
+
+```shell
+just dev
+```
+
+### Release Build
+
+```shell
+just build
+```
+
+## Usage
 
 Command line:
 ```shell
@@ -10,3 +31,8 @@ secure-editor-rs <file-name> <algorithm> <key-hex> <nonce-hex>
 
 > `<algorithm>` is always `aes-256-gcm`<br>
 > Exit `0` when success, otherwise return none `0`
+
+Export:
+```shell
+export SECURE_EDITOR=/REAL-PATH/secure-editor-rs
+```

src-tauri/README.md

@@ -1,23 +0,0 @@
-# Secure Editor Rust Edition
-
-Secure Editor written in Rust Programming Language.
-
-## Preparation
-
-```shell
-cargo install create-tauri-app --locked
-```
-
-## Build
-
-### Development Build
-
-```shell
-just dev
-```
-
-### Release Build
-
-```shell
-just build
-```