Add tts-to-webrtc example

[tyohan]

Following the discussion here and someone who asking the same thing in Slack channel, i made an example app to show how to stream from Text To Speech audio output to a WebRTC client.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 101 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (539e2aa) to head (dd9cd10).

Files with missing lines	Patch %	Lines
text-to-speech/main.go	0.00%	101 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main    #302    +/-   ##
======================================
  Coverage   0.00%   0.00%            
======================================
  Files         28      29     +1     
  Lines       2922    3023   +101     
======================================
- Misses      2922    3023   +101     

Flag	Coverage Δ
go	0.00% <0.00%> (ø)

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