New Logo for Just notes app

[Sahil-Dhawan]

I'm opening this issue because:

• Other (see below for feature requests):

supporting information:

New Logo

PR for logo updation

This is an upgrade over the default logo being used

I plan on implementing it and pushing the changes

[Sahil-Dhawan]

[Sahil-Dhawan]

this is minimalist as desired and I have added the app background for visibility otherwise the background is transparent