Updated README and documentation

[mikhail-vl]

Based on https://docs.volkovlabs.io/volkovlabs-echarts-panel/.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (52695b4) 92.85% compared to head (4881d20) 92.85%.

❗ Current head 4881d20 differs from pull request most recent head 61b7df1. Consider uploading reports for the commit 61b7df1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   92.85%   92.85%           
=======================================
  Files          16       16           
  Lines         196      196           
  Branches       24       24           
=======================================
  Hits          182      182           
  Misses         12       12           
  Partials        2        2           

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[mikhail-vl]

Looks good!