📝 update README, add installation instructions

README.md

@@ -2,3 +2,23 @@
 A simple python Flask application which adds reminders to every event in a given ICS file.
 
 See it in action at https://reminder.pimux.de
+
+## Installation
+
+### Docker
+
+`docker run gitea.pimux.de/finn/reminder:latest`
+
+### non-Docker
+
+Clone the repo, install Python virtual environment, configure webserver (or use some wsgi server)
+
+```
+git clone https://gitea.pimux.de/finn/reminder.git reminder
+cd reminder
+virtualenv .
+. bin/activate
+pip install -r requirements.txt
+cp apache_sample_config.php /etc/apache2/sites-available/my-reminder.exmaple.org.conf
+a2ensite my-reminder.exmaple.org.conf
+```