📚 Add n8n documentation page

docs/quick-start.md

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+# Quick Start
+
+
+## Give n8n a spin
+
+To spin up n8n to have a look you can run:
+
+```bash
+npx n8n
+```
+
+It will then download everything which is needed and start n8n.
+
+You can then access n8n by opening:
+[http://localhost:5678](http://localhost:5678)
+
+
+## Start with docker
+
+To just play around a little bit you can start n8n with docker.
+
+```bash
+docker run -it --rm \
+  --name n8n \
+  -p 5678:5678 \
+  n8nio/n8n
+```
+
+Be aware that all data will be lost once the docker container got removed. To
+persist the data mount the `~/.n8n` folder:
+
+```bash
+docker run -it --rm \
+  --name n8n \
+  -p 5678:5678 \
+  -v ~/.n8n:/root/.n8n \
+  n8nio/n8n
+```
+
+More information about the Docker setup can be found the README of the
+[Docker Image](https://github.com/n8n-io/n8n/blob/master/docker/images/n8n/README.md)