Add Metric Server doc to package-architecture

Package Merge Request

Package Changes

Added architecture documentation for metric server package to bigbang. bigbang/docs/understanding-bigbang/package-architecture/metricserver.md

Package MR

(Link to Package MR here)

For Issue

Closes big-bang/product/packages/metrics-server#5 (closed)

Upgrade Notices

N/A

added metricsServer statusreview labels

requested review from @aperkins, @ryan.thompson.44, @ryan.j.garcia, @chris.oconnell, and @michaelmartin

assigned to @steven.donald

mentioned in issue big-bang/product/packages/metrics-server#5 (closed)

changed title from Metric server arch doc to Add Metric Server doc to package-architecture

added kinddocs label

approved this merge request

@andrewshoell : You have been tagged in this merge request for the purpose of conducting secondary review.

approved this merge request

merged

mentioned in commit ec9f5215