Add tensorflow pytorch in techstack

Author: kshitijrajsharma

Readme.md

@@ -20,7 +20,7 @@
 
 | **CI/CD** | | [![Backend Build](https://github.com/hotosm/fair/actions/workflows/backend_build.yml/badge.svg?branch=master)](https://github.com/hotosm/fair/actions/workflows/backend_build.yml) [![Frontend Build](https://github.com/hotosm/fair/actions/workflows/frontend_build.yml/badge.svg?branch=master)](https://github.com/hotosm/fair/actions/workflows/frontend_build.yml) |
 | :--- | :--- | :--- |
-| **Tech Stack** | | ![Django](https://img.shields.io/badge/Django-092E20?style=for-the-badge&logo=django) ![React](https://img.shields.io/badge/React-20232A.svg?style=for-the-badge&logo=react&logoColor=%2361DAFB) ![Docker](https://img.shields.io/badge/docker-%230db7ed.svg?style=for-the-badge&logo=docker&logoColor=white) |
+| **Tech Stack** | | ![Django](https://img.shields.io/badge/Django-092E20?style=for-the-badge&logo=django) ![React](https://img.shields.io/badge/React-20232A.svg?style=for-the-badge&logo=react&logoColor=%2361DAFB) ![Docker](https://img.shields.io/badge/docker-%230db7ed.svg?style=for-the-badge&logo=docker&logoColor=white) ![PostgreSQL](https://img.shields.io/badge/PostgreSQL-316192.svg?style=for-the-badge&logo=postgresql&logoColor=white) ![TensorFlow](https://img.shields.io/badge/TensorFlow-FF6F00.svg?style=for-the-badge&logo=TensorFlow&logoColor=white) ![PyTorch](https://img.shields.io/badge/PyTorch-EE4C2C.svg?style=for-the-badge&logo=PyTorch&logoColor=white) |
 | **Code Style** | | [![pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white)](https://pre-commit.com) [![Black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) |
 | **Community** | | [![Slack](https://img.shields.io/badge/Slack-Join%20the%20community!-d63f3f?style=for-the-badge&logo=slack&logoColor=white)](https://slack.hotosm.org) [![All Contributors](https://img.shields.io/badge/all-contributors-red.svg?logo=github)](https://github.com/hotosm/fAIr/graphs/contributors) |
 | **Submodules** | | [![fairpredictor Repo](https://img.shields.io/badge/fairpredictor-GitHub-blue.svg?logo=github)](https://github.com/hotosm/fairpredictor) [![fair-utilities Repo](https://img.shields.io/badge/fair--utilities-GitHub-green.svg?logo=github)](https://github.com/hotosm/fair-utilities) |