Convert prometheus bridge readme to godocs

[dashpole]

fixes #4339

[dashpole]

@pellared I wanted to make the example print something out to the console, but that requires importing the stdoutmetric package. Is there a way to add dependencies only for the example?

[pellared]

@pellared I wanted to make the example print something out to the console, but that requires importing the stdoutmetric package. Is there a way to add dependencies only for the example?

No 😢 We had the same problem in the sdk/metric example. We decided to simply use a ManualReader instead. See https://github.com/open-telemetry/opentelemetry-go/blob/9bbefc6cc31995c7bdd37c69eb153fc2201c3562/sdk/metric/example_test.go#L47-L50

[pellared]

One suggestion. Awaiting for a non-Splunk approval.

[pellared]

Should we also add "Bridges" here: https://github.com/open-telemetry/opentelemetry-go-contrib#contents?

[dashpole]

Should we also add "Bridges" here: https://github.com/open-telemetry/opentelemetry-go-contrib#contents?

Done 35c2be6

[codecov]

Codecov Report

Merging #4348 (050b03a) into main (1855863) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #4348   +/-   ##
=====================================
  Coverage   82.2%   82.3%           
=====================================
  Files        144     144           
  Lines      10002   10002           
=====================================
+ Hits        8229    8232    +3     
+ Misses      1634    1632    -2     
+ Partials     139     138    -1     

see 1 file with indirect coverage changes