docs: add rough documentation about obs-portal

docs/obs-portal.md

@@ -0,0 +1,25 @@
+# OpenBikeSensor Portal
+
+## Docker Containers
+* portal
+* worker
+* db
+
+
+## Run database migrations
+
+```
+docker exec -ti obs-portal tools/upgrade.py
+```
+
+## Dump database
+
+```
+docker exec -ti --user postgres obs-portal-db pg_dump obs
+```
+
+## Restore database
+
+```
+cat dump.sql | docker exec -ti --user postgres obs-portal-db psql obs
+```