update readme

README.md

@@ -10,3 +10,35 @@ The markdown-sensitive processing of the wdiff comparison is at `server/componen
 ## Live Version
 
 The tool is live at http://dubdiff.com, feel free to use it there.
+
+## Provisioning
+
+You'll need the following:
+  - node & npm
+  - grunt and bower (`npm install -g grunt bower`)
+  - ruby (`apt install ruby`)
+  - sass (`gem install sass`)
+  - wdiff (`apt install wdiff`)
+
+The wdiff binary should be placed in the `bin` subfolder, or a link should be made to the binary. Eg. `ln -s /usr/bin/wdiff bin/wdiff`.
+
+    npm install && bower install
+    mkdir data
+
+### Low-memory environments
+
+On a low-memory machine, eg. a DigitalOcean 512MB instance, you will need to enable virtual memory. Use this guide:
+
+ - [https://www.digitalocean.com/community/tutorials/how-to-configure-virtual-memory-swap-file-on-a-vps#2]
+
+### Start on boot
+
+
+To make the application start on boot, run the following:
+
+    pm2 start grunt --name dubdiff -- serve:dist
+    pm2 startup systemd
+    pm2 save
+
+[Digital Ocean: How To Set Up a Node.js Application for Production on Ubuntu 16.04](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-16-04)
+