docs: update readme

README.md

@@ -18,27 +18,43 @@
 
 ## Features
 + [x] Built-in user management.
-+ [x] [GitHub OAuth login](https://github.com/settings/applications/new).
-+ [x] WeChat Official Account login.
++ [x] [GitHub OAuth](https://github.com/settings/applications/new).
++ [x] WeChat official account authorization (need [wechat-server](https://github.com/songquanpeng/wechat-server)).
 + [x] Email verification & password reset.
-+ [x] Request rate limitation.
++ [x] Request rate limit.
 + [x] Use GitHub Actions to build releases & Docker images. 
 + [x] Mobile friendly UI.
 
 ## Usage
-1. Download built binaries from [GitHub Releases](https://github.com/songquanpeng/gin-template/releases/latest).
+1. Download built binaries from [GitHub Releases](https://github.com/songquanpeng/gin-template/releases/latest) or build from source:
+   1. `git clone https://github.com/songquanpeng/gin-template.git`
+   2. `go mod download`
+   3. `go build -ldflags "-s -w" -o gin-template`
 2. Run it: 
    1. `chmod u+x gin-template`
-   2. `./gin-template --port 3000`
-3. The username for the initial account is `root` and the password is `123456`.
+   2. `./gin-template --port 3000 --log-dir ./logs`
+3. Command line arguments:
+
+4. The username for the initial account is `root` and the password is `123456`.
 
 ## Basic Configurations
 The system works out of the box.
 
-There are several environment variables used to configure the system:
+You can configure the system by set environment variables or specify command line arguments.
+
+After the system is up, you can use the dashboard for further configuration.
+
+### Environment Variables
 1. `REDIS_CONN_STRING`: if set, will use Redis as the store of rate limitation instead of memory.
    + Example: `REDIS_CONN_STRING=redis://default:redispw@localhost:49153`
 2. `SESSION_SECRET`: if set, will fix session secret.
    + Example: `SESSION_SECRET=random_string`
 3. `SQL_DSN`: if set, will use target SQL database instead of SQLite.
-   + Example`SQL_DSN=root:123456@tcp(localhost:3306)/gofile`
+   + Example`SQL_DSN=root:123456@tcp(localhost:3306)/gofile`
+
+### Command line Arguments
+1. `--port <port_number>`: specify the port number, if not set, will use `3000`.
+   1. Example: `--port 3000`
+2. `--log-dir <log_dir>`: specify the log dir, if not set, won't save log.
+   + Example: `--log-dir ./logs`
+3. `--version`: print version and exit.