feat: add readme and license

LICENSE

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+MIT License
+
+Copyright (c) 2024 Nya Candy
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# 贡献者图片生成器
+
+## 这是什么
+
+一个用于从 GitHub 拉取贡献者列表及对应的头像，并生成一张聚合图片的工具。
+
+配套一个定期执行的 Actions 流水线，可以将生成的图片托管在 GitHub Pages 服务上。
+
+## 如何使用
+
+它有两个环境变量：
+
+1. `REPO` 指定需要对什么仓库生成贡献者列表，例如默认的是 `Candinya/Kratos-Rebirth` 。
+2. `TOKEN` 指定调用 GitHub API 时使用的访问令牌，如果是针对开源项目、在 GitHub Actions 执行的话，可以像这里的 CI 配置一样设置成 GitHub 自动临时分配的 `${{ github.token }}` 。
+
+如果您觉得定期执行的策略不合适，您可以自行设定更为合适的策略。
+
+## 开源授权
+
+[MIT](./LICENSE)