feat: docs: rm_unverified_users cronjob

docs/INSTALL.md

@@ -0,0 +1,22 @@
+# Installation instructions
+
+## Cron jobs
+
+Run cron job at an interval of your choosing with the following comamnd:
+
+```bash
+python manage.py rm_unverified_users
+```
+
+It will delete all users that are below maximum tolerated duration
+unverified users, as configured in settings.py:
+
+```python
+HOSTEA = {
+	# <--snip--->
+    "ACCOUNTS": {"MAX_VERIFICATION_TOLERANCE_PERIOD": 60 * 60 * 24},  # in seconds
+}
+```
+
+In future, the cronjob will be run as part of the Hostea/Dashbaord and
+hence the current redundancy in configuration and cronjob duration.