#286 Documentation on how to use a secret as an env var

[vettom]

*Issue #286

*Description of changes:

• Updated README.md to include explanation for secretObjects
• ExampleSecretProviderClass.yaml API Version update
• ExampleSecretProviderClass.yaml : Added secret Objects section
• ExampleDeployment.yaml : Added env section to mount secret as env variable

Tested and validated on EKS cluster.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.15%. Comparing base (109d74a) to head (5ecc72c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #290   +/-   ##
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  Coverage   53.15%   53.15%           
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  Files           8        8           
  Lines         730      730           
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  Hits          388      388           
  Misses        332      332           
  Partials       10       10           

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