chore: Update readme with price fetching instructions

[davidterpay]

No description provided.

[codecov]

Codecov Report

Attention: 34 lines in your changes are missing coverage. Please review.

Comparison is base (262113b) 73.89% compared to head (dc05add) 73.97%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
providers/websockets/bitstamp/ws_data_handler.go	71.87%	12 Missing and 6 partials ⚠️
providers/websockets/bitstamp/messages.go	70.73%	8 Missing and 4 partials ⚠️
providers/websockets/bitstamp/parse.go	86.66%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   73.89%   73.97%   +0.08%     
==========================================
  Files         122      125       +3     
  Lines        6404     6539     +135     
==========================================
+ Hits         4732     4837     +105     
- Misses       1370     1389      +19     
- Partials      302      313      +11     

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