started file for docker related things

docker.md

@@ -0,0 +1,15 @@
+# docker
+
+- [start docker service](#start-docker-service)
+
+
+## start docker service
+
+To start the docker service, use `systemctl`:
+```bash
+sudo systemctl start docker
+```
+If you want the docker service to be started at boot, use:
+```bash
+sudo systemctl enable --now docker
+```