New exercise ✨: Knapsack

[joshiraez]

Implements #473

[joshiraez]

I updated the Contributing with a few other files that were not being generated, like the /.meta/.config.json or the instructions.md.

I also had TONS of problems downloading the configlet tool and the syncer. Trying to execute the bash commands result in errors, either using wget piped to bash, or copying the code. I believe is in the server end rather that in the script or the execution, but I have no idea. For now, the UUID I generated was a v4 UUID and the .toml file was created manually /which is no ideal but well)

[joshiraez]

I might add a mentoring.md file in the website copy for this problem. The easy way is a brute force solution using recursiveness. A naive solution might use the ration Value/Weight, but the good solutions use dynamic programming, for storing subproblems and memorization of previous functions.

[SleeplessByte]

And another one. Only things I had to change was update from main, apply eslint issues. Thank you a million!