chore: Add README.md

Author: nitpum

README.md

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+# mongo-s3-backup
+
+[![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/F1F21LCOB)
+
+Docker image for backup mongodb with s3cmd
+
+## Usage
+
+```bash
+docker run \
+	-e MONGO_URI="mongodb://root:root@localhost:27017/db" \
+	-e S3_ACCESS_KEY="ACCESS_KEY" \
+	-e S3_SECRET_KEY="SECRET_KEY" \
+	-e S3_PATH="s3://bucket/backup/" \
+	-e S3_HOST_BASE="" \
+	-e S3_HOST_BUCKET="" \
+	-e S3_WEBSITE_ENDPOINT="" \
+	ghcr.io/nitpum/mongo-s3-backup:main
+```
+
+### Environment variables
+
+- `MONGO_URI` Mongo uri example: `mongodb://root:root@localhost:27017/db`
+- `S3_ACCESS_KEY` S3 access key
+- `S3_SECRET_KEY` S3 secret key
+- `S3_PATH` S3 path example: `s3://bucket/backup/` (with trailing slash)
+- `S3_HOST_BASE` S3 host base example: `s3.amazonaws.com` or `nyc1.digitaloceanspaces.com`
+- `S3_HOST_BUCKET` S3 host bucket example: `%(bucket)s.s3.amazonaws.com` or `%(bucket)s.fra1.digitaloceanspaces.com`
+- `S3_WEBSITE_ENDPOINT` S3 website endpoint example: `http://%(bucket)s.s3-website-% (location)s.amazonaws.com/` or`http://%(bucket)s.s3-website-%(location)s.digitaloceanspaces.com/`
+
+## Support
+
+If you think this is useful, please consider support me ;)
+
+[![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/F1F21LCOB)
+
+## License
+
+[MIT License](LICENSE)