Update README.md

[helpthehack]

Please complete the following checklist if your PR is adding new link to the list:

• I've read contributing guidelines
• This PR does not introduce duplicates to the list
• The link is added at the bottom of the list category
• Suggested repository is maintained, have active community, is able to mentor new contributors and have issues with the suggested label
• The link I add follows the suggested pattern:

- [Repository Name](link-to-repository-label) _(label: beginner-friendly-label-in-the-repository)_ <br> Description

Example link formatting:

- [awesome-for-beginners](https://github.com/MunGell/awesome-for-beginners/labels/good-first-contribution) _(label: good-first-contribution)_ <br> A list of awesome beginners-friendly projects.

Good First time Beginner Friendly projects to work on:

P2PHackClub/website#6
publiclab/plots2#10324
tiagostutz/demo-warehouse-software#23
P2PHackClub/website#36
layer5io/layer5#2261
Twiggecode/Integer-Sequences#6