Links with the medium.freecodecamp is broken need to be updated to freecodecamp/newss links

2. If you get upset or stuck, read this article: Learning to Code: When It Gets Dark

Should be change to: [Learning to Code: When It Gets Dark](https://www.freecodecamp.org/news/learning-to-code-when-it-gets-dark-e485

Currently we don't have tags related to a challenge. These tags could help to identify the challenge details by keyword such as targeted conference cvpr2020, neurips2021 etc.

Deliverables

• Add a tags field (postgres array field, default=[], null=True) to Challenges Model
• List tags associated with a challenge on the [challenge list page](https://evalai.cloudcv.org/web/

Include some programming language flag with the links, to show when the link is not only about javascript, and to help people who look for training another language.

You said feedback welcome, so here it is:
Wouldn't it be nice to have an overview of the book by seeing the summary right after the Introduction in Readme.md?

In challenge 11, we have used generators to implement

for i in ../*/*py; do grep ^import $i|sed 's/import //g' ; done | sort | uniq -c | sort -nr

How about redoing same challenge with Coroutines ?

If interested, users can use below references.

1. Curious Course on Coroutines and Concurrency
2. [Coroutines](http://www.dabe

Most Java projects nowerdays are not built using javac directly; rather, they use a build tool such as Maven or Gradle. Examples of how to build a Jigsaw project (with modules and possibly module patches) using those would be very useful.