Add info that the project only works with Node.js

[JapuDCret]

Which problem is this PR solving?

• Clearing up a misunderstanding someone might have in understanding the opentelemetry-exporter-jaeger package

Short description of the changes

• Added info that the package is only supported in Node.js applications

[codecov]

Codecov Report

Merging #1869 (f8d33e3) into main (5f4e479) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1869      +/-   ##
==========================================
+ Coverage   92.62%   92.65%   +0.03%     
==========================================
  Files         174      174              
  Lines        6030     6030              
  Branches     1278     1278              
==========================================
+ Hits         5585     5587       +2     
+ Misses        445      443       -2     

Impacted Files	Coverage Δ
...ges/opentelemetry-instrumentation-http/src/http.ts	95.54% <0.00%> (+0.80%)	⬆️