MAINT: update README

[misialq]

Closes #15.

• add new badges
• add installation instructions
• add functionality table (blocked by ENH: add Bracken abundance estimation to classify-kraken action #38 and FEAT: eggnog mapper functionality #25)
• add dev environment section

Needs #38, #25 and #40.

[github-actions]

This PR/issue depends on:

• ENH: add Bracken abundance estimation to classify-kraken action #38

Copilot reviewed 2 out of 2 changed files in this pull request and generated no suggestions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.60%. Comparing base (b6d068a) to head (01de37b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   95.60%   95.60%           
=======================================
  Files          34       34           
  Lines        1956     1956           
  Branches      226      226           
=======================================
  Hits         1870     1870           
  Misses         48       48           
  Partials       38       38           

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