docs: Adding external examples from AWS SAM CLI App Templates

[AlexeySoshin]

Issue #, if available:

#1278

Description of changes:

Adding external templates updates in the AWS SAM CLI App Templates repo to the Examples Readme

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[scottgerring]

LGTM. Holding off merging until #1316 is merged

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (baa3592) 79.65% compared to head (9dbc79d) 79.65%.

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Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1318   +/-   ##
=========================================
  Coverage     79.65%   79.65%           
  Complexity      639      639           
=========================================
  Files            73       73           
  Lines          2345     2345           
  Branches        253      253           
=========================================
  Hits           1868     1868           
  Misses          397      397           
  Partials         80       80           

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication