Make installation instructions more clear

[unbrand]

Is your feature request related to a problem? Please describe.
Installation instructions not clear about what needs to be installed and the installation of Movielens data

Describe the solution you'd like
cmake and wget are needed. Also describe the exact commands to get Movielens data with wget and where to put downloaded file.

Describe alternatives you've considered
n/a

Additional context
n/a

[unbrand]

also, unzip is missing in the install doc