Add some clarification for some files under config/*

I didn't add a lot of them because I am not very familiar about how they work and I am not sure if we really need to explain files like config/database.yml because if you know Rails you must know how that works. At any rate, I think this is a beginning and we could keep documenting more files in the future. Closes #18373

Add some clarification for some files under config/*
f7605c08 · Lin Jen-Shin · 39c43463 · f7605c08
Commit f7605c08 authored Jun 22, 2016 by Lin Jen-Shin
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README.md config/README.md +21 -0

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+# Configuration files Documentation
+
+Note that most configuration files (`config/*.*`) committed into
+[gitlab-ce](https://gitlab.com/gitlab-org/gitlab-ce) **would not be used** for
+[omnibus-gitlab](https://gitlab.com/gitlab-org/omnibus-gitlab). Configuration
+files committed into gitlab-ce are only used for development.
+
+## gitlab.yml
+
+You could find most of GitLab configuration here.
+
+## mail_room.yml
+
+It's intended to be an ERB file because `mail_room` would use ERB to evaluate
+it before parsing it as a YAML file. It would try to read values from
+`gitlab.yml` so you should configure it there.
+
+## resque.yml
+
+It's called `resque.yml` for historical reason, and we're not using rescue
+at the moment. It's served as a **Redis configuration file** instead.