added descriptor object to Account class #520

Job	Run time
Check	4m 55s
Ruby	0s
Java	0s
.NET	0s
Rust	0s
Python / Build / Build	1m 54s
Python / Lint	19s
Python / Documentation	44s
Python / Mypy	44s
Python / Browser Tests (edge, ubuntu) / Integration Tests (edge, ubuntu)	14m 22s
Python / Browser Tests (firefox, ubuntu) / Integration Tests (firefox, ubuntu)	37m 41s
Python / Browser Tests (chrome, ubuntu) / Integration Tests (chrome, ubuntu)	15m 8s
Python / Remote Tests (firefox) / Integration Tests (remote, firefox)	11m 8s
Python / Browser Tests (safari, macos) / Integration Tests (safari, macos)	2m 43s
	1h 29m 38s

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