adding charts for rating and difficulty distributions #119
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Thank you for the excellent work. I frequently visit this website when selecting courses during registration. I believe adding charts and filters for specific time periods would be really helpful, as course ratings often vary depending on the current instructor and TAs. Additionally, it can be time-consuming to scroll through all the reviews to compare recent ratings with older ones.
For example, in the Machine Learning course, the overall rating is 3.13, but the majority of students rated it between 1, 5, and 4. (because of the last semester)
In this pull request, I've added pie charts to display the course rating and difficulty, showing the percentage of each rating category.