Update README to include maintainers doc

[bm1549]

Description

Add maintainers doc as a link from the repository README

Motivation

Increases discoverability of the maintainers doc since it's very useful for new engs starting in dd-trace-cpp

Additional Notes

Jira ticket: [PROJ-IDENT]

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-19 14:24:20

Comparing candidate commit 4d300c0 in PR branch bm1549-patch-1 with baseline commit dc5e762 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 1 metrics, 0 unstable metrics.

[dmehala]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.46%. Comparing base (dc5e762) to head (4d300c0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   94.46%   94.46%           
=======================================
  Files          73       73           
  Lines        3811     3811           
=======================================
  Hits         3600     3600           
  Misses        211      211           

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