Add support for Chi-square distribution

[hot9cups]

Go through the Gaussian distribution class, the Binomial class and the Exponential class which are subclasses of General distribution class.

I would like to expand this to include a fourth distribution, the Chi-square Probability Distribution.
It should be able to calculate mean, standard deviation, and create basic plots like those in the classes I linked.

[rachitmanas]

I would like to try working on this issue. Please assign it to me.

[hot9cups]

@rachitmanas sure thing :)
Before you go ahead, would you mind commenting about the approach you're going to take ?

[rachitmanas]

@hot9cups Basically I will just copy the same format as of other distributions made. I will change the parameters and formula and some function definition according to the Chi Square distribution.

[rachitmanas]

Can I use scipy or mpmath for incomplete gamma function calculation?

[hot9cups]

@rachitmanas sounds good.
About the scipy function, we'll have a look at that once you draft the PR
I'd ideally like to keep the dependencies to a minimal, but if there's no other way it's fine :)

[hot9cups]

@rachitmanas Hope you're doing well. How are you progressing with the issue? :)

[hot9cups]

I'm assuming @rachitmanas isn't working on this anymore, this issue is still open.

[m0hit-kumar]

I would like to work on it

[hot9cups]

@m0hit-kumar assigned