update pando doc

[whyubel1eve]

Introduction of Pando SDK integration for now. The pando-client is in the process(a client with better SDK).

[codecov-commenter]

Codecov Report

Merging #166 (70c2903) into main (76b2450) will decrease coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   54.33%   53.99%   -0.35%     
==========================================
  Files          36       36              
  Lines        2052     2052              
==========================================
- Hits         1115     1108       -7     
- Misses        826      831       +5     
- Partials      111      113       +2     

Impacted Files	Coverage Δ
pkg/metadata/backup.go	32.77% <0.00%> (-3.89%)	⬇️

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