Add install instruction when using the glot/docker-run image

Author: prasmussen

docs/install/docker-ubuntu-20.10.md

@@ -0,0 +1,52 @@
+# Installation instructions for ubuntu 20.10
+
+#### Install and configure docker
+
+```bash
+apt install docker.io
+
+# Disable docker networking (optional)
+echo '{
+    "ip-forward": false,
+    "iptables": false,
+    "ipv6": false,
+    "ip-masq": false
+}' > /etc/docker/daemon.json
+
+# Restart docker daemon
+systemctl restart docker.service
+```
+
+#### Pull the docker-run image
+
+```bash
+docker pull glot/docker-run:latest
+```
+
+
+#### Pull images for the languages you want
+
+```bash
+docker pull glot/python:latest
+docker pull glot/rust:latest
+# ...
+```
+
+#### Start the docker-run container
+
+```bash
+docker run --detach --restart=always --publish 8088:8088 --volume /var/run/docker.sock:/var/run/docker.sock --env "API_ACCESS_TOKEN=my-token" glot/docker-run:latest
+```
+
+#### Check that everything is working
+
+```bash
+# Print docker-run version
+curl http://localhost:8088
+
+# Print docker version, etc
+curl --header 'X-Access-Token: my-token' http://localhost:8088/version
+
+# Run python code
+curl --request POST --header 'X-Access-Token: my-token' --header 'Content-type: application/json' --data '{"image": "glot/python:latest", "payload": {"language": "python", "files": [{"name": "main.py", "content": "print(42)"}]}}' http://localhost:8088/run
+```