add readme

README.md

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+# Chunk replicator
+
+## Example Usage
+
+```python
+from chunk_replicator import (
+    EbrainsDataproxyHttpReplicatorAccessor,
+    HttpMirrorSrcAccessor,
+    User,
+    DataProxyBucket,
+)
+import os
+from neuroglancer_scripts.precomputed_io import get_IO_for_existing_dataset
+
+bigbrain_url = "https://neuroglancer.humanbrainproject.eu/precomputed/BigBrainRelease.2015/8bit"
+bigbrain_accessor = HttpMirrorSrcAccessor(bigbrain_url)
+
+auth_token=os.getenv("AUTH_TOKEN")
+user = User(auth_token=auth_token)
+bucket = DataProxyBucket(user, "MY_BUCKET_NAME")
+
+proxy = EbrainsDataproxyHttpReplicatorAccessor(dataproxybucket=bucket, prefix="bigbrain_2015")
+io = get_IO_for_existing_dataset(bigbrain_accessor)
+import json
+proxy.store_file("info", json.dumps(io.info).encode("utf-8"))
+bigbrain_accessor.mirror_to(proxy)
+```
+
+## License
+
+MIT