Adds doc for HAproxy

examples/haproxy/Dockerfile

@@ -0,0 +1,12 @@
+# Pull nginx base image
+FROM nginx:latest
+
+# Expost port 80
+EXPOSE 80
+
+# Copy custom configuration file from the current directory
+COPY nginx.conf /etc/nginx/nginx.conf
+
+# Start up nginx server
+CMD ["nginx"]
+