Add support for nRF24L01+ radio module

[ogorodnik]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[pat-rogers]

I recommend changing each occurrence of "Self" to "This" for the sake of consistency with the rest of the library but that's not the end of the world. ;-)

[ogorodnik]

Indeed. Self to This renaming done :)

[reznikmm]

Will it work for NRF24L01 (without +)?

[reznikmm]

This Markdown file is badly formatted. I suggest list items (or table) to make it readable

[ogorodnik]

Done

[ogorodnik]

For NRF24L01 Air_Data_Rate should be Rate_1Mbps.

[reznikmm]

I don't like "inversed logic" like No_ACK : Boolean or

  function Is_No_ACK_Allowed
     (This   : NRF24L01P_Driver;
      No_ACK : Boolean) return Boolean;

I prefer ACK : Boolean and Is_ACK_Required. It's simpler to reason in "positive logic" for me.

But I don't object if you merge it as is.