Merge pull request keshavsingh3197#135 from keshavsingh4522/keshav

Todo-app in flask

Author: keshavsingh3197

Flask/Day 1

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+Subproject commit cf3f5fc59c8a42db3ad40f0436c3353639933cd1

Flask/readme.md

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+- install virtualenv on ubuntu system
+```bash
+sudo apt-get install python3-venv
+```
+- create virtualenv on system
+```sh
+python3 -m venv my-project-env
+```
+- activate the environment
+```sh
+source my-project-env/bin/activate
+```
+- deactivate enevironment when work is done
+```sh
+deactivate
+```
+- install flask sqlalchamy for database
+```sh
+pip3 install flask-sqlalchemy
+```
+```python
+from app import db
+db.create_all()
+```
+
+- Important Links /check sqlite file data online
+```
+https://inloop.github.io/sqlite-viewer/
+https://flask-sqlalchemy.palletsprojects.com/en/2.x/quickstart/#simple-relationships
+```
+- heroku deployment
+```py
+pip install gunicorn
+pip freeze >requirements.txt
+heroku login
+git init
+git add .
+git commit -m "messsage"
+heroku create todo-codewithkeshav
+git push heroku master
+```