docs: add a brief introduction in README

[Wwwsylvia]

Resolves: #58

[codecov-commenter]

Codecov Report

Merging #83 (97df607) into main (ab5d0bd) will increase coverage by 0.18%.
The diff coverage is 85.18%.

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@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   82.27%   82.46%   +0.18%     
==========================================
  Files           6        6              
  Lines         378      382       +4     
==========================================
+ Hits          311      315       +4     
  Misses         45       45              
  Partials       22       22              

Impacted Files	Coverage Δ
native_store.go	83.33% <66.66%> (-3.63%)	⬇️
registry.go	81.25% <85.71%> (-2.09%)	⬇️
store.go	80.95% <100.00%> (+4.12%)	⬆️

[Wwwsylvia]

Codecov Report

Merging #83 (04c047d) into main (ab5d0bd) will increase coverage by 0.18%.
The diff coverage is 85.18%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   82.27%   82.46%   +0.18%     
==========================================
  Files           6        6              
  Lines         378      382       +4     
==========================================
+ Hits          311      315       +4     
  Misses         45       45              
  Partials       22       22              

Impacted Files Coverage Δ
native_store.go 83.33% <66.66%> (-3.63%) ⬇️
registry.go 81.25% <85.71%> (-2.09%) ⬇️
store.go 80.95% <100.00%> (+4.12%) ⬆️

Wondering why this PR triggers a test coverage change... 🤨

[shizhMSFT]

LGTM