gh-94: Add an example of computing 2PCF likelihood for the photometric probes

[zahrabaghkhani]

📌 Related Issue

Closes #94

✨ What’s been added or changed?

• We add an example of how to compute likelihood for photometric two point correlation functions

🧪 How was it tested?

• It was tested on my local computer

📸 Screenshots (if applicable)

🧠 Anything to keep in mind?

🔍 Checklist

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[gcanasherrera]

@all-contributors please add @zahrabaghkhani for code, ideas, bugs

[allcontributors]

@gcanasherrera

I've put up a pull request to add @zahrabaghkhani! 🎉

[gcanasherrera]

This is a bit obsolete. Could you please @zahrabaghkhani get it fixed? :)

[zahrabaghkhani]

@gcanasherrera Sure, I will fix it.

[zahrabaghkhani]

@gcanasherrera Sorry for the delay. I just updated the notebook. Please let me know what you think.