removing some excess from the Dockerfile and adding a README

Dockerfile

@@ -1,4 +1,5 @@
 FROM debian:jessie
+MAINTAINER Larry Price <larry@larry-price.com>
 
 ENV DEBIAN_FRONTEND noninteractive
 
@@ -16,9 +17,6 @@ RUN service postgresql start
 
 RUN git clone https://github.com/francoisjacquet/rosariosis.git /usr/src/rosariosis
 
-WORKDIR /usr/src/rosariosis
-RUN git checkout -b 2.7.4
-
 RUN rm -rf /var/www/html && mkdir -p /var/www && ln -s /usr/src/rosariosis/ /var/www/html && chmod 777 /var/www/html
 
 ADD bin/init /init

README

@@ -0,0 +1,23 @@
+docker-rosariosis
+=================
+
+A Dockerfile that installs the latest [RosarioSIS](http://www.rosariosis.org/). This file pulls from the master branch, but can be easily modified to pull from any other available branch or tagged release.
+
+## Installation
+
+```
+git clone https://github.com/larryprice/docker-rosario.git
+cd docker-rosario
+docker build -t rosariosis .
+```
+
+## Usage
+
+RosarioSIS uses a Postgres database:
+
+``` bash
+$ docker create --name rosariodb postgres:9.4
+$ docker run -d --link rosariodb:rosariodb rosariosis
+```
+
+Port 80 will be exposed, so you can visit `localhost` to get started. The default username is `admin` and the default password is `admin`.