chore: Add capitalization guidelines to CONTRIBUTING.md

[michael-s-molina]

SUMMARY

Add capitalization guidelines to CONTRIBUTING.md (#12343)

@rusackas @junlincc @mihir174

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #12685 (68a743d) into master (5504762) will decrease coverage by 1.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12685      +/-   ##
==========================================
- Coverage   64.55%   63.32%   -1.24%     
==========================================
  Files        1018      486     -532     
  Lines       49787    29970   -19817     
  Branches     4971        0    -4971     
==========================================
- Hits        32141    18978   -13163     
+ Misses      17468    10992    -6476     
+ Partials      178        0     -178     

Flag	Coverage Δ
cypress	?
javascript	?
python	63.32% <ø> (-0.81%)	⬇️

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

Impacted Files	Coverage Δ
superset/db_engines/hive.py	0.00% <0.00%> (-85.72%)	⬇️
superset/databases/commands/create.py	32.65% <0.00%> (-59.19%)	⬇️
superset/sql_validators/postgres.py	50.00% <0.00%> (-50.00%)	⬇️
superset/db_engine_specs/hive.py	54.61% <0.00%> (-29.24%)	⬇️
superset/views/database/mixins.py	59.64% <0.00%> (-22.81%)	⬇️
superset/databases/commands/update.py	85.71% <0.00%> (-8.17%)	⬇️
superset/db_engine_specs/presto.py	81.38% <0.00%> (-6.71%)	⬇️
superset/databases/schemas.py	93.40% <0.00%> (-6.05%)	⬇️
superset/databases/dao.py	94.11% <0.00%> (-5.89%)	⬇️
superset/databases/api.py	86.55% <0.00%> (-5.47%)	⬇️
... and 552 more

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[mihir174]

LGTM! 👍

[mihir174]

Hey @michael-s-molina thanks for the PR! We are expecting to add more design guidelines in addition to the capitalization one.

I am thinking we could add a page for design guidelines and have the capitalization guidelines as one section within that page. The design guidelines page can go exactly where you proposed to put the capitalization guidelines on CONTRIBUTING.md

cc: @garden-of-delete

[garden-of-delete]

LGTM!