Update contributing guide so new contributors can successfully install dependencies

[icmpecho]

What do these changes do?

Update contributing guide so new contributors can successfully install dependencies

Are there changes in behavior for the user?

no

Related issue number

Fixes #4160

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> for example (588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the pr
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: "Fix issue with non-ascii contents in doctest text files."

[codecov-io]

Codecov Report

Merging #4161 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4161   +/-   ##
=======================================
  Coverage   97.63%   97.63%           
=======================================
  Files          43       43           
  Lines        8825     8825           
  Branches     1381     1381           
=======================================
  Hits         8616     8616           
  Misses         88       88           
  Partials      121      121

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0a9c4ba...2b06a83. Read the comment docs.

[asvetlov]

This can work but I prefer a couple commands here:

make cythonize
pip install -r requirements/dev.txt

[asvetlov]

Another option can be adding make develop command and documenting it.
It can be an alias for .develop but without a confusing dot at the front.

[icmpecho]

@asvetlov ok I'll fix that. how about something like make install-dev

[asvetlov]

how about something like make install-dev

Sounds good

[asvetlov]

Thanks!