Add more introduction on spyder.
Add more introduction on spyder.

This needs cross-checking against university machines.

josh-gree/maths-with-python,linglaiyao1314/maths-with-python,diandianxiyu/maths-with-python,jaehyuk/maths-with-python,statkclee/maths-with-python,huiyi1990/maths-with-python,Honglongwu/maths-with-python,jamesmarva/maths-with-python,IanHawke/maths-with-python