Simple bash tool

Hello Council,

Polkacli is essentially a list of prewritten bash commands that can be easily called and run.

The help with setting up a node and running one (monitoring, updating, restarting...) and thus should be especially helpful to our validators.

The code can be found here

The address of one of kusamaxi's validators can be verified on twitter, the address in this tip request is the parent account of that.