Update README.md

README.md

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 # github-stat-script
 
 tutorial for myself to write in golang and to use [go-github](https://github.com/google/go-github)
+
+## Usage
+
+1. `git clone https://github.com/yshnb/github-stat-script.git`
+2. `cd ./github-stat-script`
+3. fill in valid `accessToken` from Github
+
+After, you can run the below command
+```
+$ go run main.go --metrics=star google/go-github
+target repository: google/go-github
+metrics: star
+star: 1079
+```
+like this.
+
+## Available metrics
+
+For now, it can only get the numbers of github star in each repository.
+
+My plan ....
+
+- issue
+- pull_requests (open/closed)
+- code changes(additions/deletions)
+- etc.
+