Add count GraphQL guide

[lauriejim]

Description of what you did:

This PR adds a Guide to the docs.
Some people from the community asked about count function in GraphQL.
Aggregation is not working well and is not available for every database, this guide let you understand how to add custom GraphQL query, in this case, a count query.

[alexandrebodin]

Looks good, just minor stuff

[derrickmehaffy]

Would this not just be easier to add to the default schema until aggregations can be reviewed?

Else a user would need to duplicate this same thing for every single model

[codecov]

Codecov Report

Merging #5447 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5447   +/-   ##
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  Coverage   17.73%   17.73%           
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  Files         687      687           
  Lines       10151    10151           
  Branches     1643     1643           
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  Hits         1800     1800           
  Misses       6961     6961           
  Partials     1390     1390           

Flag	Coverage Δ
#front	13.14% <ø> (ø)
#unit	37.04% <ø> (ø)

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[alexandrebodin]

@derrickmehaffy that basically means starting implementing aggregations in bookshelf :D
We should start working on it "soon"

[derrickmehaffy]

@derrickmehaffy that basically means starting implementing aggregations in bookshelf :D
We should start working on it "soon"

I mean in this case just handling count since it's just a basic one that's calling the service but I do see your point. (In my case I just handle this in a header on all requests so I don't have to manually call counts)

[derrickmehaffy]

@lauriejim fixed the PR feedback for you with a few other changes.

[alexandrebodin]

@derrickmehaffy that basically means starting implementing aggregations in bookshelf :D
We should start working on it "soon"

I mean in this case just handling count since it's just a basic one that's calling the service but I do see your point. (In my case I just handle this in a header on all requests so I don't have to manually call counts)

Yes we really need to introduce real pagination :)

[derrickmehaffy]

@derrickmehaffy that basically means starting implementing aggregations in bookshelf :D
We should start working on it "soon"

I mean in this case just handling count since it's just a basic one that's calling the service but I do see your point. (In my case I just handle this in a header on all requests so I don't have to manually call counts)

Yes we really need to introduce real pagination :)

Yup still got that discussion issue open about that and other parameters 😉

[alexandrebodin]

LGTM