Add how to use Azure Container Apps

[koudaiii]

Why

I want to use ko on Azure as well. I want to add how to use ko on Azure, as there are other examples in the README.

ref docs: Mention other deployment targets #461

What

Update README.

[codecov-commenter]

Codecov Report

Merging #561 (18d2637) into main (f5762be) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #561   +/-   ##
=======================================
  Coverage   48.58%   48.58%           
=======================================
  Files          43       43           
  Lines        2229     2229           
=======================================
  Hits         1083     1083           
  Misses        959      959           
  Partials      187      187           

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[koudaiii]

I've just signed the CLA. ✅ Please Re-run 😄

[imjasonh]

Thanks!

[koudaiii]

@imjasonh Thank you 😄