Fix quick start guide

[vinnamkim]

Summary

• Fix quick start guide according to the recent changes.

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[wonjuleee]

Great work!

[cih9088]

Since this is a quick start guide, users might just copy and paste the commands without knowing about messing up current directory by datum project create. How about adding creating project directory?

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5095007) 78.70% compared to head (a337388) 78.70%.

Additional details and impacted files

@@               Coverage Diff               @@
##           releases/1.2.0     #963   +/-   ##
===============================================
  Coverage           78.70%   78.70%           
===============================================
  Files                 231      231           
  Lines               26420    26420           
  Branches             5258     5258           
===============================================
  Hits                20794    20794           
  Misses               4401     4401           
  Partials             1225     1225           

Flag	Coverage Δ
macos-11_Python-3.8	77.72% <ø> (ø)
ubuntu-20.04_Python-3.8	78.68% <ø> (ø)
windows-2019_Python-3.8	78.58% <ø> (ø)

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