Created updating the bitwarden image (markdown)

updating-the-bitwarden-image.md

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+Updating is straightforward, you just make sure to preserve the mounted volume. If you used the bind-mounted path as in the example above, you just need to `pull` the latest image, `stop` and `rm` the current container and then start a new one the same way as before:
+
+```sh
+# Pull the latest version
+docker pull mprasil/bitwarden:latest
+
+# Stop and remove the old container
+docker stop bitwarden
+docker rm bitwarden
+
+# Start new container with the data mounted
+docker run -d --name bitwarden -v /bw-data/:/data/ -p 80:80 mprasil/bitwarden:latest
+```
+Then visit [http://localhost:80](http://localhost:80)
+
+In case you didn't bind mount the volume for persistent data, you need an intermediate step where you preserve the data with an intermediate container:
+
+```sh
+# Pull the latest version
+docker pull mprasil/bitwarden:latest
+
+# Create intermediate container to preserve data
+docker run --volumes-from bitwarden --name bitwarden_data busybox true
+
+# Stop and remove the old container
+docker stop bitwarden
+docker rm bitwarden
+
+# Start new container with the data mounted
+docker run -d --volumes-from bitwarden_data --name bitwarden -p 80:80 mprasil/bitwarden:latest
+
+# Optionally remove the intermediate container
+docker rm bitwarden_data
+
+# Alternatively you can keep data container around for future updates in which case you can skip last step.
+```