Adding major or popular language modes to Emacs distribution

[Yuchen Pei]

Hello,

I notice some glaring omissions of modes supporting major / 
popular languages like php, haskell and wikitext in Emacs, though 
there are widely used versions available externally as packages.

I feel it is important that Emacs support these languages 
natively.

What is the process of adding these modes?  My understanding is:

1. Ask the maintainer of a mode to contribute the mode to Emacs.
2. If for some reason the maintainer is unable or unwilling to add 
the mode, someone writes the mode and contribute to Emacs.

In step 2, is it conventional to add the mode to GNU ELPA first, 
before moving it into Emacs itself?

I am asking because I am interested in working on some of these 
modes.

--
Best,
Yuchen

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