docs: add OSS Projects list

PROJECTS.md

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+# Open source projects we depend on
+
+This is a list of major open source projects we use at Chaos Genius. We are thankful to all the maintainers for open sourcing and continuing to sustain these projects.
+
+This is a part of the [FOSS Pledge](https://fossunited.org/foss-pledge)
+
+## Tools, programming languages and databases
+
+- [Python](https://www.python.org/)
+- [NodeJS and npm](https://nodejs.org/)
+- [bash](https://www.gnu.org/software/bash/)
+- [git](https://git-scm.com/)
+- [Docker](https://www.docker.com/) and [docker compose](https://github.com/docker/compose)
+- [nginx](https://www.nginx.com/)
+- [supervisor](http://supervisord.org/)
+- [PostgreSQL](https://www.postgresql.org/)
+- [Redis](https://redis.io/)
+- [Alpine Linux](https://www.alpinelinux.org/)
+
+## Python libraries
+
+Some of the main python libraries we use:
+- [Flask](https://flask.palletsprojects.com/en/2.1.x/)
+- [SQLAlchemy](https://www.sqlalchemy.org/)
+- [Celery](https://github.com/celery/celery)
+- [Pandas](https://pandas.pydata.org/)
+- [NumPy](https://numpy.org/)
+- [pytest](https://docs.pytest.org/en/7.1.x/)
+
+See [prod dependencies](https://github.com/chaos-genius/chaos_genius/blob/main/requirements/prod.txt) and [dev dependencies](https://github.com/chaos-genius/chaos_genius/blob/main/requirements/dev.txt) for the full list.
+
+## NodeJS libraries
+
+Some of the main NodeJS libraries we use:
+- [React](https://reactjs.org/)
+- [Redux](https://redux.js.org/)
+- [Highcharts](https://www.highcharts.com/)
+
+See the full list [here](https://github.com/chaos-genius/chaos_genius/blob/main/frontend/package.json).
+