Added information about the app to README

README.md

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 # Calendar
 
 A Simple Calendar App for Android
+
+I recently searched for a calendar app on the Android markets, but didn't find one that satisfied my needs. So I created my own 😁. Hope you like it.
+
+
+## About
+
+Calendar can do the following:
+
+- Add appointments
+- Show appointments for a particular day
+- Easily switch between consecutive days
+- Send reminder notifications for upcoming appointments
+- Create a batch of recurring appointments
+- Send a daily overview notification with your appointments for that day
+- Send sleep reminder notifications (because we're humans and humans don't have the discipline to maintain a regular sleep schedule)
+- Automatically delete old appointments
+- Create and load backups of your appointments
+- Some other small things not worth mentioning
+
+
+## Installation
+
+You can download the installation file for Calendar [here](https://bitscuit.be/dl/Calendar.apk).
+
+To install it on your device, follow these steps:
+
+1. Move the `.apk` file to your device
+2. On your smartphone, open a file manager and locate the file
+3. Launch the installation wizard by tapping on the file
+4. Follow the steps in the wizard. You may need to 'allow installation from unknown sources'
+5. Calendar is now installed on your phone 🥳
+
+You could also build Calendar from source, but that's a bit more involved.
+
+
+## Contributing
+
+Want to help develop Calendar? Awesome!
+
+Feel free to fork this repository, add new features and submit a pull request. Thanks!
+
+
+## Disclaimer
+
+Copyright 2021 Thomas Van Acker
+
+This project is available under the [GPLv3 license](https://www.gnu.org/licenses/gpl-3.0.en.html). This program comes with ABSOLUTELY NO WARRANTY.
+
+I am not resposible for any damage that may be caused by this software. USE AT YOUR OWN RISK.
+
+