Add Sponsors Button to GitHub Repo

[mroeschke]

While discussion on other support avenues are still ongoing, I think it would still be beneficial to add the a Sponsors Button to the repo that points to https://pandas.pydata.org/donate.html

Note: https://www.flipcause.com/secure/cause_pdetails/MzA3OA== is the direct page to donate but this link doesn't appear as "donate friendly" IMO

Let me know if there's a better link to reference

Reference to the Support Button on Numpy's page: numpy/numpy#13700

[codecov]

Codecov Report

Merging #26694 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26694      +/-   ##
==========================================
- Coverage   91.88%   91.87%   -0.01%     
==========================================
  Files         174      174              
  Lines       50701    50701              
==========================================
- Hits        46588    46584       -4     
- Misses       4113     4117       +4

Flag	Coverage Δ
#multiple	90.41% <ø> (ø)	⬆️
#single	41.9% <ø> (-0.12%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97% <0%> (-0.12%)	⬇️

---

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[codecov]

Codecov Report

Merging #26694 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26694      +/-   ##
==========================================
- Coverage   91.88%   91.87%   -0.01%     
==========================================
  Files         174      174              
  Lines       50701    50701              
==========================================
- Hits        46588    46584       -4     
- Misses       4113     4117       +4

Flag	Coverage Δ
#multiple	90.41% <ø> (ø)	⬆️
#single	41.9% <ø> (-0.12%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97% <0%> (-0.12%)	⬇️

---

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 649ad5c...c313b3d. Read the comment docs.

[jreback]

does this need a newline?

[mroeschke]

Looks like other projects have a newline in their yml, will add one.

[jreback]

lol thanks

[jreback]

where exactly should the sponsor button appear?

[mroeschke]

Looks like we need to enable it in the "Settings" menu of the repository, but I can't immediately find it:

https://help.github.com/en/articles/displaying-a-sponsor-button-in-your-repository

[mroeschke]

I may not have enough permissions to access the repository settings. Can you enable it @jreback?