Tutorial

[slushiegoose]

Summary

This pull request adds a tutorial command which displays a tutorial of an extension if one is specified, or if a tutorial on how to add and remove extensions if one is not specified. (close #107)

Collaboration with @sudoPom

Checklist

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

• Have you tested the changes? (pytest & dpytest)
• Have you followed PEP-8 for naming and styling?
• Has your code been properly documented with RestructuredText docstrings?
• Have you added your changes to CHANGELOG.md under the [Unreleased] heading?
• If your code added new bot commands, have you updated documentation.json?

• All of this code is your own, or follows the author repo's licence.

[codecov]

Codecov Report

Merging #226 (fe27ae3) into master (06d6fe0) will decrease coverage by 0.12%.
The diff coverage is 53.84%.

@@            Coverage Diff             @@
##           master     #226      +/-   ##
==========================================
- Coverage   82.27%   82.14%   -0.13%     
==========================================
  Files          26       26              
  Lines        6453     6468      +15     
==========================================
+ Hits         5309     5313       +4     
- Misses       1144     1155      +11     

Flag	Coverage Δ
unittests	82.14% <53.84%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cogs/BaseCog.py	57.14% <26.66%> (-4.21%)	⬇️
KoalaBot.py	81.72% <66.66%> (+0.19%)	⬆️
cogs/Announce.py	96.39% <100.00%> (ø)
cogs/ColourRole.py	88.73% <100.00%> (ø)
cogs/IntroCog.py	85.32% <100.00%> (ø)
cogs/ReactForRole.py	48.01% <100.00%> (ø)
cogs/TextFilter.py	91.69% <100.00%> (ø)
cogs/TwitchAlert.py	58.06% <100.00%> (ø)
cogs/Verification.py	65.85% <100.00%> (ø)
cogs/Voting.py	61.99% <100.00%> (ø)

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