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

❌ Patch coverage is 53.84615% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.14%. Comparing base (06d6fe0) to head (fe27ae3).
⚠️ Report is 533 commits behind head on master.

Files with missing lines	Patch %	Lines
cogs/BaseCog.py	26.66%	11 Missing ⚠️
KoalaBot.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            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%)	⬇️

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