rofl-appd-localnet: Add appd for Localnet

[matevz]

Requires #2430

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-sdk canceled.

Name	Link
🔨 Latest commit	b7c526b
🔍 Latest deploy log	https://app.netlify.com/projects/oasisprotocol-oasis-sdk/deploys/698f4ae5c8a68a00086014cb

[codecov]

Codecov Report

❌ Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.56%. Comparing base (3c5c665) to head (b7c526b).

Files with missing lines	Patch %	Lines
rofl-appd-localnet/src/main.rs	0.00%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2430      +/-   ##
==========================================
- Coverage   48.64%   48.56%   -0.08%     
==========================================
  Files         224      225       +1     
  Lines       16104    16132      +28     
==========================================
+ Hits         7834     7835       +1     
- Misses       8210     8237      +27     
  Partials       60       60              

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