Error message when no board selected is bad for beginners

[tigoe]

When you try tp compile with no board selected, you get the message

Compilation error: Error: 2 UNKNOWN: no FQBN provided

This is poorly written. Beginners, and even many advanced users, will not know what a FQBN is. Rewrite this in plan language, e.g.

You need to select a board type before compiling

Steps to reproduce:

1. Open a new sketch without selecting a board
2. Compile

[ubidefeo]

@tigoe we're already looking into how to make this better.
Issue #37 covers this and more. The low priority label was assigned because we were in release mode.
It will soon get back to medium because it's source of confusion.

PS: we're all very happy to see you use it <3

[per1234]

Closing as duplicate of #37 #62

@thekunalsaini please refrain from commenting unless you have directly relevant information to share.