docs: add README

ghibli-gallery-crawler/README.md

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+# download-images
+
+Simple image downloader (from 2020-08-31). Both Python and JavaScript variants included.
+
+## Usage
+
+```bash
+# Python
+python3 download_images.py
+
+# JavaScript
+npm install
+node download_images.js
+```
+
+Edit the script to set the source URLs and target directory.
+
+## License
+
+Apache-2.0