Add Clear Linux Project documentation

clearlinux/README-short.txt

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+Official docker build of Clear Linux OS for Intel Architecture

clearlinux/content.md

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+# Clear Linux OS
+
+This serves as the official [Clear Linux OS](https://clearlinux.org) image.
+
+%%LOGO%%
+
+The `clearlinux:latest` tag will point to `clearlinux:base` which will track toward the latest release version of the distribution.
+
+This image contains the os-core and os-core-update bundles, the latter can be used to add additional Clear Linux OS components (see [here](https://clearlinux.org/documentation/swupdate_about_sw_update.html) for more details about swupd and [here](https://clearlinux.org/documentation/bundles_overview.html) for more information on bundles).
+
+The following Dockerfile will install the editors and dev-utils bundles on top of the base image
+
+```sh
+FROM clearlinux:base
+RUN swupd bundle-add editors dev-utils
+```
+
+Where editors contains the usual suspects for command line editors and dev-utils contains some handy development tools like strace, gdb and valgrind.

clearlinux/github-repo

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+https://github.com/clearlinux/docker-brew-clearlinux