Make the project specific bear feature more discoverable

[underyx]

After #2450 is closed there should be a default directory inside project directories where custom bears can be added. This feature is really useful, but hard to come across right now.

area/documentation

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CC @sils1297, @AbdealiJK

[sils]

We should also write about the .bears directory after it exists, see #2450

[underyx]

How about adding a new flag/subcommand to coala that generates a boilerplate bear in .coabears/, like cookiecutter? We could also extend that feature to make it really easy to submit the bear for inclusion in the coala-bears project.

[sils]

CC @mr-karan that would be part of his tool

[mr-karan]

I did something of this sorts for coala-bears @underyx https://gitlab.com/coala/coala-bear-management

[sils]

@mr-karan we'll need this for normal bears as well

[Adrianzatreanu]

This issue was moved to coala/documentation#28