Implements consumer Ping()

[simodima]

• Implement a consumer Ping() function to test queue connectivity
  • For SQS driver it checks the AWS connectivity by calling GetQueueAttributes
  • For In Memory driver do nothing
• Improves README.md
• More test coverage

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.33%. Comparing base (a61bad0) to head (26693b0).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   87.90%   89.33%   +1.43%     
==========================================
  Files          10       11       +1     
  Lines         281      347      +66     
==========================================
+ Hits          247      310      +63     
- Misses         25       30       +5     
+ Partials        9        7       -2     

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