[README] how to make list-[checks|rulesets] work from git

[jpopelka]

When one runs list-checks -r or list-rulesets directly from git repo one gets:

File "/home/jpopelka/git/user-cont/colin/colin/core/ruleset/ruleset.py", line 208, in get_ruleset_directory
    raise ColinRulesetException(msg)
colin.core.exceptions.ColinRulesetException: Ruleset directory cannot be found.

We can either hack get_ruleset_directory() to discover also local (in git repo) rulesets/ or add a notice into README.

[lachmanfrantisek]

There is a more general problem with directories --for now, it used one or another, but not merge the content.

In case of the list-ruleset it would be nice to look at:

• ./rulesets/
• .local/share/colin/rulesets/
• /usr/local/share/colin/rulesets/

If one of these directories does not exist, no error will be raised. (Conflicts will be overwritten global -> local -> current directory.)
Finally, all found files will be returned.

[TomasTomecek]

+1

I also agree on documenting such behavior.

[lachmanfrantisek]

Yesterday, we are discussing this problem and got with the following:

1. For now, use first valid from the folllowing

• ./rulesets
• .local/share/colin/rulesets/
• /usr/local/share/colin/rulesets/

2. In the future, use all of them.

[TomasTomecek]

I am going to close this; I opened #106 to track what Franta wrote and my PR #104 actually addresses this.

@jpopelka once #104 is merged, please check whether it resolves your issue