Created Plot web interface (markdown)

Plot-web-interface.md

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+### Setup
+By default PlotSquared comes installed and configured to use the public web interface that we host. Downloads are anonymous, and it requires no setup on your end. 
+
+### Disclaimer:
+Metrics must be enabled. Any files you upload to the public web interface become public domain. If this is an issue you may host your own web interface.
+
+### Setting up your own web interface:
+Source: https://github.com/boy0001/plotupload
+Download: https://github.com/boy0001/plotupload/archive/master.zip
+Configuration section: `config/settings.yml`
+``` yml
+web:
+  url: http://empcraft.com/plots/
+  server-ip: your.ip.here
+```
+
+### Downloading:
+`/plot download`    
+This will generate a random key, and upload the file to the configured web server.
+
+### Pasting a download
+`/plot schematic paste url:<key>`    
+Where `<key>` is the key generated from the download
+
+### Saving
+`/plot save`    
+
+### Loading
+`/plot load`
+
+### Media:
+https://youtu.be/w-0VushTSz4