DOC: Adding ArcticDB to the ecosystem.md page
This PR adds ArcticDB to the ecosystem.md under the IO section. It includes basic read and write examples to help users get started with saving pandas DataFrames to ArcticDB.

this PR is the fixes from this closed PR https://github.com/pandas-dev/pandas/pull/59820

(I accidently closed the older PR I'm not too sure how I'm not a git expert) 


Thanks @ms041223 