Add an example, link it in the README

[jmacd]

Description: Add an example to test the smallest configuration of the Lightstep metrics SDK for stand-alone use.

Testing: This is a test.

Documentation: Linked from README.md

[mwear]

LGTM, but there is another reference to test.NewServer in examples/tracing/trace_test.go that is passing in an argument. See: https://github.com/lightstep/otel-launcher-go/pull/219/files#file-examples-tracing-trace_test-go-L27.

[codecov-commenter]

Codecov Report

Merging #219 (8955aae) into main (b60529d) will not change coverage.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##             main     #219   +/-   ##
=======================================
  Coverage   94.26%   94.26%           
=======================================
  Files          62       62           
  Lines        3312     3312           
=======================================
  Hits         3122     3122           
  Misses        145      145           
  Partials       45       45           

Impacted Files	Coverage Δ
pipelines/test/test.go	93.93% <33.33%> (ø)

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[jmacd]

Fixed, PTAL.

[jaronoff97]

left one non-blocking comment, otherwise this looks great. Thanks for putting this together!