Adding Slido 16x16 icon

[VaibhavDesai]

Adding this icon to the momentum library so that it can be used to display Slido Analytics on the CH Analytics page

Description

Here is a screenshot of the where the icon will be used.

The UX lead on this is Mina Yoo (miyoo@cisco.com)

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (953f71e) 94.17% compared to head (b054798) 93.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1501      +/-   ##
==========================================
- Coverage   94.17%   93.99%   -0.18%     
==========================================
  Files         134      134              
  Lines       18974    18974              
  Branches     2902     2899       -3     
==========================================
- Hits        17868    17834      -34     
- Misses       1106     1140      +34     

see 8 files with indirect coverage changes

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