Improve README; check-uptime
Check uptime seconds.
-## Setting
+## Synopsis
+```
+check-uptime --warning-under=600 --critical-under=120
+```
+
+## Installation
+
+First, build this program.
+
+```
+go get github.com/mackerelio/go-check-plugins
+cd $(go env GOPATH)/src/github.com/mackerelio/go-check-plugins/check-uptime
+go install
+```
+
+Or you can use this program by installing the official Mackerel package. See [Using the official check plugin pack for check monitoring - Mackerel Docs](https://mackerel.io/docs/entry/howto/mackerel-check-plugins).
+
+
+Next, you can execute this program :-)
```
-[plugin.checks.uptime]
-command = "/path/to/check-uptime --warning-under=600 --critical-under=120"
+check-uptime --warning-under=600 --critical-under=120
```
-## Options
+
+## Setting for mackerel-agent
+
+If there are no problems in the execution result, add s setting in mackerel-agent.conf .
```
+[plugin.checks.check-uptime-sample]
+command = ["check-uptime", "--warning-under", "600", "--critical-under", "120"]
+```
+
+## Usage
+### Options
+
+```
+ --warn-under=N (DEPRECATED) Trigger a warning if under the seconds
-w, --warning-under=N Trigger a warning if under the seconds
-c, --critical-under=N Trigger a critial if under the seconds
+ --warn-over=N (DEPRECATED) Trigger a warning if over the seconds
-W, --warning-over=N Trigger a warning if over the seconds
-C, --critical-over=N Trigger a critical if over the seconds
```
+
+## For more information
+
+Please execute `check-uptime -h` and you can get command line options.
