add some docker-commands

docs/docker.md

@@ -1,9 +1,47 @@
 # Docker
 
 ## Handling Builds
+### Building a Docker image
+```bash
+sudo docker build -t tag/name .
+```
+> **_NOTE:_** The `-t`-tag stands for Tag followed by the Tag-Name and the `.` is the location of the Dockerfile.
 
 ## Handling Images
+### List all images
+```bash
+sudo docker images
+```
+
+### Delete all unused Images
+```bash
+sudo docker image prune -a
+```
 
 ## Handlicng Containers
+### List all running containers
+```bash
+sudo docker ps
+```
 
+### List all containers
+```
+sudo docker ps -a
+```
+
+### Delete a running container
+```
+sudo docker rm -f <containername>
+```
+> **_NOTE:_** The `-f`-tag stands for force-command
+
+### List all Containers with `Exited` Code
+```bash
+sudo docker ps -q -f status=exited
+```
+
+### Delete all containers with `Exited` Code
+```bash
+sudo docker rm $(sudo docker ps -q -f status=exited)
+```
 ## Handling private registry