Added latest and minimal Dockerfile

README.md

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+# Supported tags and respective `Dockerfile` links
+
+* `minimal` [(minimal/Dockerfile)](https://github.com/Hackebein/docker-garrysmod/blob/master/minimal/Dockerfile)
+* `latest` [(latest/Dockerfile)](https://github.com/Hackebein/docker-garrysmod/blob/master/latest/Dockerfile)
+* ~~`full` [(full/Dockerfile)](https://github.com/Hackebein/docker-garrysmod/blob/master/full/Dockerfile).~~ coming soon
+
+# What is Garry's Mod?
+
+Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.
+
+# Update Hooks
+
+* on base image update (supported by Docker Hub)
+* on repository update (supported by Docker Hub)
+* ~~on steam repository content update (supported by [Huginn](https://github.com/Hackebein/docker-garrysmod/blob/master/huginn.json))~~ coming soon
+
+# Quick Start
+
+## Basic
+
+docker run --expose 27015 hackebein/garrysmod
+
+## Public
+
+docker run --expose 27015 -e "GLST=..." hackebein/garrysmod
+
+Get your [GLST](http://steamcommunity.com/dev/managegameservers) (`APPID: 4000`)
+
+## Public with Workshop Collection
+
+docker run --expose 27015 -e "GLST=..." -e "AUTHKEY=..." -e "WORKSHOPCOLLECTIONID=..." hackebein/garrysmod
+
+Get your [AUTHKEY](http://steamcommunity.com/dev/apikey)
+
+## Config
+
+docker run --expose 27015 -e "GLST=..." -e "AUTHKEY=..." -e "WORKSHOPCOLLECTIONID=..." --volume ./mycfg:/opt/garrysmod/garrysmod/volume hackebein/garrysmod
+
+Autoload `server.cfg` from volume.
+
+## Additional Environment
+
+PORT: Connection Port
+(`Default: 27015`)
+
+TICKRATE: Tickrate of server, **Attention:** Change not recommended
+(`Default: 66`)
+
+CLIENTPORT:
+(`Default: 27005`)
+
+GAMEMODE: 
+(`Default: sandbox`)
+
+MAP: Map on Server start
+(`Default: gm_flatgrass`)
+
+CONFIG: Server config, **Attention:** Change not recommended
+(`Default: server.cfg`)
+
+MAXPLAYERS: Max players
+(`Default: 16`)
+
+LOADURLIMG: URL for LOADURL default
+(`Default: <URL>`)
+
+LOADURL: Loading screen URL
+(`Default: <LOADURLIMG Fullscreen>`)
+
+CUSTOMPARAMETERS: additional parameters
+(`Default: `)