[WIP] Add gamma tutorial with the new GUI

[chenghuzi]

Follow up of #535

[jasmainak]

Great!

[codecov-commenter]

Codecov Report

Merging #583 (569c257) into master (b833ca6) will decrease coverage by 0.01%.
The diff coverage is 97.43%.

❗ Current head 569c257 differs from pull request most recent head 66d640d. Consider uploading reports for the commit 66d640d to get more accurate results

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@@            Coverage Diff             @@
##           master     #583      +/-   ##
==========================================
- Coverage   92.19%   92.19%   -0.01%     
==========================================
  Files          22       22              
  Lines        4282     4291       +9     
==========================================
+ Hits         3948     3956       +8     
- Misses        334      335       +1     

Impacted Files	Coverage Δ
hnn_core/gui/gui.py	94.75% <97.43%> (-0.12%)	⬇️

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[jasmainak]

Is there a link on CircleCI @chenghuzi ?

[chenghuzi]

sorry for the delayed response, but link for what