Add ARM template for Azure

[karpinsn]

• Add ARM template for hosting container on Azure Container Instances
  with data persisted to an Azure Storage Account.
• Add README for Azure ARM template and link from main README.

[karpinsn]

Addresses #408

[Fank]

@SuperSandro2000 does it looks fine to you too?

[StopMotionCuber]

Small comment from the Azure Docs, there is a guide on how to implement a "deploy to Azure" button. I think that might be a nice addition for the README

[PolygeneLubricants]

I used to host a Factorio server with a similar template as this, however when I try to run this setup now, I am unable to connect to the server, with the client error: "waiting for the server to save the map".

The server gives the error on startup: "12.938 Error InterruptibleStdioStream.cpp:61: Got EOF on stdin; closing", but then continues.
When attempting to connect, the server logs state:

132.905 Warning ServerSynchronizer.cpp:112: nextHeartbeatSequenceNumber(7188) peer(1) wants a heartbeat(5987) that we don't have.

Full server logs:
server-logs.txt