Install.md

[Tobey16]

I can not list possible updates that the sdk might need as decribed in the file.
I already have a running build enviroment, that works with release-94 on Ubuntu 18.04 Server.
The part is: "./android list sdk for a list of packages to update"
It says: No such file or directory

[matkoniecz]

See #14157 - it appears that this repository is defunct and no longer used