Add fluentd document

fluentd/README-short.txt

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+Fluentd is an open source data collector for unified logging layer

fluentd/content.md

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+# What is Fluentd?
+
+%%LOGO%%
+
+Fluentd is a streaming data collector for unified logging layer hosted by [CNCF](https://www.cncf.io/project-faq/fluentd/). Fluentd lets you unify the data collection and consumption for a better use and understanding of data.
+
+For more information, check [official site](https://www.fluentd.org/) and [documentation site](https://docs.fluentd.org/).
+
+# How to run images
+
+```bash
+$ docker run -p 24224:24224 -p 24224:24224/udp -u fluent -v /path/to/dir:/fluentd/log %%IMAGE%%
+2019-01-16 11:49:55 +0000 [info]: parsing config file is succeeded path="/fluentd/etc/fluent.conf"
+...
+2019-01-16 11:58:27 +0000 [info]: #0 [input1] listening port port=24224 bind="0.0.0.0"
+2019-01-16 11:58:27 +0000 [info]: #0 fluentd worker is now running worker = 0
+```
+
+Docker's official images support only v1.4.2 or later. If you want to know more details, check [fluentd-docker-image README](https://github.com/fluent/fluentd-docker-image/blob/master/README.md).

fluentd/github-repo

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+https://github.com/fluent/fluentd-docker-image

fluentd/license.md

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+View [license information](https://github.com/fluent/fluentd/blob/master/LICENSE) for the software contained in this image.

fluentd/maintainer.md

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+[Fluentd](%%GITHUB-REPO%%)