Add write, read, drained

[andreiavrammsd]

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[codecov]

Codecov Report

Attention: Patch coverage is 89.18919% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.22%. Comparing base (4f9e263) to head (8604366).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
include/msd/channel.hpp	88.88%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
- Coverage   94.44%   91.22%   -3.22%     
==========================================
  Files           2        2              
  Lines          36       57      +21     
  Branches        2        5       +3     
==========================================
+ Hits           34       52      +18     
- Partials        2        5       +3     

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