Add README.md

README.md

+# README
+
+This docker image contains the [can-utils package](https://github.com/linux-can/can-utils).
+
+To be able to use/run it, the following steps should be followed:
+1. The host exposes the virtual interface vcan0. To create a virtual can port **on the host**:
+    * sudo modprobe vcan
+    * sudo ip link add dev vcan0 type vcan
+    * sudo ip link set up vcan0
+2. Generate access token
+    * go to [Access Tokens page](https://gitlab.cs.pub.ro/-/profile/personal_access_tokens)
+    * add token name
+    * select read_registry and write_registry
+    * create token
+    * save the token to a file, as it is visible only once
+3. Login
+    * docker login gitlab.cs.pub.ro:5050 -p "INSERT_ACCESS_TOKEN*
+4. Pull the image
+    * docker pull gitlab.cs.pub.ro:5050/reaact/can-container
+5. Run it
+    * docker run --name ubuntu-can --network=host gitlab.cs.pub.ro:5050/reaact/can-container:latest
+6. Scan the traffic **on the host**
+    * candump vcan0
+
+Useful links:
+* https://www.lagerdata.com/articles/forwarding-can-bus-traffic-to-a-docker-container-using-vxcan-on-raspberry-pi
+* https://stackoverflow.com/questions/21022749/how-to-create-virtual-can-port-on-linux-c