add nextcloud-client

nextcloud-client/Dockerfile

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+FROM alpine:3.10
+
+MAINTAINER Newnius <newnius.cn@gmail.com>
+
+RUN apk add --no-cache nextcloud-client
+
+CMD ["nextcloudcmd", "--help"]

nextcloud-client/README.md

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+# Run Nextcloud Client in docker
+
+## What is `Nextcloud`
+
+
+```
+docker run \
+	-it \
+	--rm \
+	--name nextcloud-client \
+	--mount type=bind,source=/path/to/file,target=/data \
+	newnius/nextcloud-client nextcloudcmd -u $USER -p $PASSWORD /data https://demo.nextcloud.com/remote.php/webdav/dir
+```
+