Update documentation with basic info

README.md

@@ -1,2 +1,41 @@
 # mr-vercetti/docker-svencoop
-[Sven Co-Op](https://store.steampowered.com/app/225840/Sven_Coop/) server in Docker container.
+Dedicated [Sven Co-Op](https://www.svencoop.com/manual/startup.html) server in a Docker container.
+
+![Sven Co-op logo](https://raw.githubusercontent.com/mr-vercetti/docker-svencoop-server/master/.misc/svencoop-logo.jpg "Sven Co-op logo")
+
+## Usage
+Examples of how you can run this container on your own machine. 
+
+#### docker-compose
+```
+services:
+   svencoop:
+      image: mrvercetti/svencoop-server
+      container_name: svencoop
+      environment:
+         - GAME_PARAMS=-console -port 27015 +maxplayers 8 +map stadium4 +log on
+         - GAME_NAME=Sven Co-Op server
+         - GAME_PASSWORD=123
+      ports:
+         - 27015:27015
+         - 27015:27015/udp
+      restart: unless-stopped
+```
+
+#### docker-cli
+```
+docker run -d \
+    --name=svencoop \
+    --env GAME_PARAMS=-console -port 27015 +maxplayers 8 +map stadium4 +log on
+    --env GAME_NAME=Sven Co-Op server \
+    --env GAME_PASSWORD=123 \
+    --port 27015:27015 \
+    --port 27015:27015/udp \
+    --restart unless-stopped \ 
+    mrvercetti/svencoop-server
+```
+### Environment variables
+All of them are optional. Don't quote them as this can cause weird issues.
+* `GAME_PARAMS` - startup parameters for server, you can specify port, map, max number of players and much [more](https://www.svencoop.com/manual/server-basic.html#start-cmd).
+* `GAME_NAME` - name which will be displayed in server browser.
+* `GAME_PASSWORD` - if specified, the server will ask for it when joining the game.