Update README for release

Author: Ritam Chakraborty

README.md

@@ -1,3 +1,49 @@
 # Sorting Visualizer 
 
-A *sorting visualizer* app in flutter.
+A *sorting visualizer* app in flutter. It visualize the sorting algorithm by sorting the bars
+in ascending order. In this application how the elements change their position is being displayed.
+
+## Sorting Algorithms
+
+- Bubble Sort
+- Insertion Sort
+- Selection Sort
+- Merge Sort
+- Quick Sort
+
+## Features
+
+- Visualize 2 to 1000 elements
+- Change the speed of the sorting
+- Interacting elements are displayed in different colors
+- Change theme to *light* or *dark*
+- Selected theme is remembered between start ups
+
+## Demo
+
+> Light Theme
+
+<p align="center">
+    <img alt="Desktop Light" src="assets/demos/light_web.gif" height="384" width="512" hspace="10" vspace="10">
+    <img alt="Mobile Light" src="assets/demos/light_mobile.gif" height="384" width="335" hspace="10" vspace="10">
+</p>
+
+> Dark Theme
+
+<p align="center">
+    <img alt="Desktop Dark" src="assets/demos/dark_web.gif" height="384" width="512" hspace="10" vspace="10">
+    <img alt="Mobile Dark" src="assets/demos/dark_mobile.gif" height="384" width="335" hspace="10" vspace="10">
+</p>
+
+## Libraries Used
+- [provider](https://pub.dev/packages/provider)
+- [flutter_bloc](https://pub.dev/packages/flutter_bloc)
+- [hydrated_bloc](https://pub.dev/packages/hydrated_bloc)
+
+## How to use
+
+Download the apk from [here]().
+
+Or visit the website [here](https://ritamchakraborty.github.io/sorting_visualizer/#/).
+
+