Update README.md

[brianmcilwrath]

Improve README.md - content ans spelling

Testing instructions:

Read README!

Types of changes

• [x] Bug fix (non-breaking change that fixes an issue)
• [ ] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] The code follows the code style of this project.
• [ ] The changes require a documentation update.
• [ ] Documentation has been updated accordingly.
• [ ] Tests cover all changes in this PR.
• [ ] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #85 into master will increase coverage by 0.14%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   86.29%   86.43%   +0.14%     
==========================================
  Files          61       61              
  Lines        2758     2758              
  Branches      227      227              
==========================================
+ Hits         2380     2384       +4     
+ Misses        324      322       -2     
+ Partials       54       52       -2

Impacted Files	Coverage Δ
...configuration_db/sip_config_db/_config_db_redis.py	81.77% <0%> (+1.97%)	:arrow_up:

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