docs: add README.md

README.md

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+# GitHub Remove Repository
+
+<p align="center">
+  <a href="https://github.com/skmatz/github-remove-repository/actions?query=workflow%3Arelease">
+    <img
+      src="https://github.com/skmatz/github-remove-repository/workflows/release/badge.svg"
+      alt="release"
+    />
+  </a>
+  <a href="https://goreportcard.com/report/github.com/skmatz/github-remove-repository">
+    <img
+      src="https://goreportcard.com/badge/github.com/skmatz/github-remove-repository"
+      alt="go report card"
+    />
+  </a>
+  <a href="./LICENSE">
+    <img
+      src="https://img.shields.io/github/license/skmatz/github-remove-repository"
+      alt="license"
+    />
+  </a>
+  <a href="./go.mod">
+    <img
+      src="https://img.shields.io/github/go-mod/go-version/skmatz/github-remove-repository"
+      alt="go version"
+    />
+  </a>
+  <a href="https://github.com/skmatz/github-remove-repository/releases/latest">
+    <img
+      src="https://img.shields.io/github/v/release/skmatz/github-remove-repository"
+      alt="release"
+    />
+  </a>
+</p>
+
+## Install
+
+### Binary
+
+Download from [GitHub Releases](https://github.com/skmatz/github-remove-repository/releases).
+
+### Source
+
+```sh
+go get github.com/skmatz/github-remove-repository/...
+```
+
+## Usage
+
+```bash
+> ghrm skmatz github-remove-repository
+```
+
+```console
+> ghrm --help
+
+ghrm is the GitHub repository remover.
+
+Usage:
+  ghrm [flags]
+  ghrm [command]
+
+Available Commands:
+  completion  Output shell completion (bash/fish/powershell/zsh)
+  help        Help about any command
+  token       Prompt for the GitHub access token
+  version     Show version
+
+Flags:
+  -f, --force     skip confirmation
+  -h, --help      help for ghrm
+  -V, --version   show version
+
+Use "ghrm [command] --help" for more information about a command.
+```