Create README.md

Author: funbringer

README.md

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+# Prerequisites for [pg_pathman](https://github.com/postgrespro/pg_pathman) packaging
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+This repo contains everything you might need to create pg_pathman's system package. Currently we provide build scripts for:
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+* [Archlinux](https://www.archlinux.org/) (master branch)
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+One day this list will definitely become larger.