Add a new section theory with various resources and add to courses

[aarohikulkarni10]

Added a new section "E-notes" that includes various notes and books pdf

[kasbah]

Hey, thanks very much for collecting these. Could you please change:

• Change the style to conform to the rest of the links in the page. I.e. a link with the name and a short description of each link.
• Fix the second link, it doesn't go anywhere.
• When I read "E-Notes" it doesn't tell me anything, is there a better name for these materials maybe?

[aarohikulkarni10]

Hello! Thank you. I will do that, give me some time please.

[aarohikulkarni10]

Please check and let me know if it looks fine now. 😃 Thank you.

[joaoantoniocardoso]

Hi @aarohikulkarni10, I think it is fine, just needs a rebase, can you do it? Thanks!