Add instructions for Spacemacs

[yihuajack]

Add instructions for Spacemacs.
Relate to solving wakatime #97.

[Anton-Latukha]

That would mean there is 2 sources of truth to maintain.

It is probably enough to give URL to the official Spacemacs docs on this stuff: https://develop.spacemacs.org/layers/+web-services/wakatime/README.html.

I also had problems using mouse clickable Customize menus in Emacs together with having Spacemacs configuration. Spacemacs configuration is declarative, while Customize menus save the state. And IDK is advising use of them in Spacemacs is the way.

[alanhamlett]

@Anton-Latukha that sounds reasonable... @yihuajack what do you think about updating this PR where the instructions link to Installing WakaTime with Spacemacs docs instead?

[Anton-Latukha]

At this point Spacemacs distro essentially became rolling, so that is why it is a link to https://develop.spacemacs.org/, since "stable" Spacemacs is a 3-4 years back time machine and "stable" docs largely not maintained & out of date, because all maintainers and community lives on the develop

Spacemacs "stable" is essentially abandoned (the last major stable release was >4 years ago (Version 0.200.0 - Oct 5, 2016, last minor release Version 0.200.13 - Jan 25, 2018 - that is almost 3 years to the current date). syl20bnr gives-up stubbornness very slowly, even with such things as keeping the develop brunch in the back & the "stable" (frozen) master branch (link) upfront and for ~3 years. People used to arrive at the project frontpage (link) and be puzzled - looking at the branch activity - is a project even alive? (and the activity graphs were showing the frozen master branch also - it was in effect for 3 years.
So eventually the representative branch was switched to develop. But the situation keeps, two-fold. I and many (probably most Spacemacs users) use https://develop.spacemacs.org/ as Spacemacs, but there is also 3 years old master branch that is still advertised:

>3 years ago I smartly sneaked-in the develop reference so the syl20bnr would merge it into the project GitHub front page:

For stable releases:

git clone https://github.com/syl20bnr/spacemacs ~/.emacs.d

For development updates and participation:

git clone -b develop https://github.com/syl20bnr/spacemacs ~/.emacs.d

It is still the same reference, so creator still advertises the frozen branch first as a stable release. With that decision the: https://spacemacs.org/ goes coupled.

IDK why Spacemacs so far not switched instructions & front-facing docs to the state of affairs in the distro. syl20bnr gave up front facing branch, but not waterfall model release dream, Spacemacs front buffer greats everyone with:

|                         VERSION 0.300 IS ALMOST OUT!                               │

That threat to form stable hangs there 1 month less than I use Spacemacs (for 3.5 years). I gave waiting for stable releases after a 0.5-1 year of use and as others - switched to develop aka the rolling world.

Lets just say syl20bnr is stubborn to admit the stable release in such wast rolling community process is not possible.

So that is only to explain why URL is to https://develop.spacemacs.org/, probably the right way is to link to both.

[yihuajack]

Thanks for suggestion, updated

[Anton-Latukha]

And I am sorry for hijacking the thread, just a drive-by thing.

It feels really dirty to come like this and write in other people's PRs.