docs: Add a short description of what Noice is (#1150)

* docs: Update README.md

Short description of what Noice is

* update README.md

---------

Co-authored-by: Ashutosh Gangwar <ashutoshgngwr@gmail.com>

README.md

@@ -11,6 +11,17 @@
 [![Android][gw-android-badge]][gw-android]
 [![codecov][codecov-badge]][codecov]
 
+For a lot of people, a little uniform background noise is helpful to remain calm
+and focused. In some cases, it also boosts productivity and lowers the effects
+of stress and anxiety. Background noise also masks tinnitus, calms agitated
+infants and improves reading and meditation experiences.
+
+Noice for Android allows you to create personalised sound environments. It
+enables you to combine different sounds at different volume levels to create
+perfect ambient atmospheres. These custom sound surroundings let you drown out
+distractions and allow you to concentrate. You can also use it to generate a
+serene, peaceful aura that encourages you to relax and fall asleep.
+
 ## Download
 
 <a href="https://play.google.com/store/apps/details?id=com.github.ashutoshgngwr.noice">