Add Adminer official image

adminer/README-short.txt

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+Database management in a single PHP file.

adminer/content.md

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+# Adminer
+
+## What is Adminer?
+
+Adminer (formerly phpMinAdmin) is a full-featured database management tool written in PHP. Conversely to phpMyAdmin, it consist of a single file ready to deploy to the target server. Adminer is available for MySQL, PostgreSQL, SQLite, MS SQL, Oracle, Firebird, SimpleDB, Elasticsearch and MongoDB.
+
+> [adminer.org](https://www.adminer.org)
+
+%%LOGO%%
+
+## How to use this image
+
+### Standalone
+
+	$ docker run --link some_database:db -p 8080:8080 adminer
+
+Then you can hit `http://localhost:8080` or `http://host-ip:8080` in your browser.
+
+### FastCGI
+
+If you are already running a FastCGI capable web server you might prefer running adminer via FastCGI:
+
+	$ docker run --link some_database:db -p 9000:9000 adminer:fastcgi
+
+Then point your web server to port 9000 of the container.
+
+Note: This exposes the FastCGI socket to the Internet. Make sure to add proper firewall rules or use a private Docker network instead to prevent a direct access.
+
+## Supported Drivers
+
+While Adminer supports a wide range of database drivers this image only supports the following out of the box:
+
+-	MySQL
+-	PostgreSQL
+-	SQLite
+-	SimpleDB
+-	Elasticsearch
+
+To add support for the other drivers you will need to install the following PHP extensions on top of this image:
+
+-	sqlsrv (MS SQL)
+-	oci8 (Oracle)
+-	interbase (Firebird)
+-	mongo (MongoDB)

adminer/github-repo

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+https://github.com/TimWolla/docker-adminer

adminer/license.md

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+View [license information](https://github.com/vrana/adminer/blob/master/readme.txt) for the software contained in this image.