Update README.md

Add badge with number of Docker pulls including a link to the repository in Docker Hub.

Author: Pyrax

README.md

@@ -1,4 +1,4 @@
-SA-MP Docker container
+SA-MP Docker container [![Docker pulls](https://img.shields.io/docker/pulls/pyrax/samp.svg "Number of Docker pulls")](https://hub.docker.com/r/pyrax/samp/)
 ======================
 
 This repository features some Dockerfiles for setting up a SA-MP server through Docker containers.
@@ -35,4 +35,4 @@ docker run -d -p 7777:7777/udp -e SAMP_RCON_PASSWORD=secret -e SAMP_HOSTNAME="SA
 docker run -d -p 7777:7777/udp -e SAMP_RCON_PASSWORD=secret -e SAMP_PLUGINS="crashdetect" --name test pyrax/samp
 # "rcon_password" exists in the server.cfg, so the value is changed from "changeme" (default) to "secret"
 # "plugins" does not exist in the server.cfg, therefore a line containing "plugins crashdetect" is being appended to the server.cfg
-```
+```