Improve Rnote description (#63)

Add Rnote features from official site and github link

Author: Duarte Ramos

apps/rnote.md

@@ -1,8 +1,29 @@
 # RNOTE
 
- Rnote is a vector-based drawing app for sketching, handwritten notes and to annotate documents and pictures.
+Rnote is an open-source vector-based drawing app for sketching, handwritten notes and to annotate documents and pictures. It is targeted at students, teachers and those who own a drawing tablet and provides features like Pdf and picture import and export, an infinite canvas and an adaptive UI for big and small screens. 
+
+## Features
+
+- Adaptive UI focused on stylus input
+- Pressure-sensitive stylus input with different and configurable stroke styles
+- Create many different shapes with the shape tool
+- Move, rotate, resize and modify existing content with the selection tool
+- Different document expansion layouts ( fixed pages, continuous vertical, infinite in every direction, .. )
+- Customizable background colors, patterns, sizes
+- Customizable page format
+- (Optional) pen sounds
+- Reconfigurable stylus button shortcuts
+- An integrated workspace browser for quick access to related files
+- Drag & Drop, clipboard support
+- PDF, Bitmap and SVG image import
+- Document, document pages and selection export to many formats including SVG, PDF, Xopp
+- Save and load the documents in the native .rnote file format
+- Tabs to work on multiple documents at the same time
+- Autosave, printing
+
 
  SITE: https://github.com/pkgforge-dev/Rnote-AppImage
+ GITHUB: https://github.com/flxzt/rnote
 
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