Documentation and playbook for writable snapshot

[Kritika-Bhateja-03]

Description

A few sentences describing the overall goals of the pull request's commits.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, pep8, linting, or security issues
• I have performed Ansible Sanity test using --docker default
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

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Codecov Report

Attention: Patch coverage is 92.85714% with 19 lines in your changes missing coverage. Please review.

Project coverage is 82.11%. Comparing base (19d8681) to head (3235473).
Report is 2 commits behind head on main.

Files	Patch %	Lines
plugins/modules/writable_snapshots.py	89.02%	8 Missing and 10 partials ⚠️
...lugins/module_utils/mock_writable_snapshots_api.py	94.73%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   82.23%   82.11%   -0.12%     
==========================================
  Files         123      127       +4     
  Lines       13298    13729     +431     
  Branches     1965     2020      +55     
==========================================
+ Hits        10936    11274     +338     
- Misses       1762     1838      +76     
- Partials      600      617      +17     

Flag	Coverage Δ
units	82.11% <92.85%> (-0.12%)	⬇️

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