Add guide on offering to receive media tracks

[mickel8]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.53%. Comparing base (738771f) to head (e0de672).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
- Coverage   87.58%   87.53%   -0.05%     
==========================================
  Files          40       40              
  Lines        2231     2231              
==========================================
- Hits         1954     1953       -1     
- Misses        277      278       +1     

see 1 file with indirect coverage changes

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