add Porting a backtrader strategy notebook

[jacopomaroli]

as per #113 :)

[polakowo]

Merging, and congrats on your first contribution!

[polakowo]

I just noticed that you're still not shown as a contributor. Strangely, under the commit b63def5 your photo and name are shown, but not link to your Github profile. Can you resolve this? If not, you can make another PR with any cosmetic change to vectorbt using your current Github account and I will approve it to add your profile as a contributor.

[jacopomaroli]

thank you for noticing it :) I Indeed had an email address in my ssh config which was not present in my github account.
as per instructions here https://docs.github.com/en/github/setting-up-and-managing-your-github-profile/why-are-my-contributions-not-showing-up-on-my-profile adding a .patch after the commit URL shows such address.
I added it to my profile and github should rebuild my contribs graph within 24h!

[polakowo]

If it still won’t show under contributors on the front page of vectorbt, just submit a PR with a slight change to readme/notebook, like adding an extra space somewhere :)