added small documentation

README.md

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+# Sossu flask
+This is the sossu's main page.
+
+## Running
+To run this on this server, one should just start the systemd service sossu-flask.service with
+the command 
+```bash
+systemctl start sossu-flask.service
+```
+
+There exists a symlink from `sossunVerkkosivut/sossu-flask.service -> /etc/systemd/system/sossu-flask.service`.
+The systemd service file waits for network connectivity before starting and should be enabled by default to run
+after system rebooting or on failure.
+
+If systemd service is not needed the app can be run by 
+```bash
+python wsgi.py
+```
+
+
+## Virtual environment
+If one needs to update the `pip` packages or something else to do with such things, there exists a virtual env
+at `.venv`. If that does not exist, create it with `python -m venv .venv`
+
+After that you need to activate it with (in linux at least)
+```bash
+source .venv/bin/activate
+```
+
+Then you can install the required packages with
+```bash
+pip install -r requirements.txt
+```