Add spn testing setup

spn/testing/simple/README.md

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+# Setup Guide
+
+1. Build SPN Hub
+
+```
+cd ../../../cmds/hub/
+./build
+```
+
+2. Reset any previous state (for a fresh test)
+
+```
+./reset-databases.sh
+```
+
+3. Change compose file and config template as required
+
+Files:
+- `docker-compose.yml`
+- `config-template.json`
+
+4. Start test network
+
+```
+./run.sh
+```
+
+5. Option 1: Join as Hub
+
+For testing just one Hub with a different build or config, you can simply use `./join.sh` to join the network with the most recently build hub binary.
+
+6. Option 2: Join as Portmaster
+
+For connecting to the SPN test network with Portmaster, execute portmaster like this:
+
+sudo ../../../cmds/portmaster-core/portmaster-core --disable-shutdown-event --devmode --log debug --data /opt/safing/portmaster
+
+Note:
+This uses the same portmaster data and config as your installed version.
+As the SPN Test net operates under a different ID ("test" instead of "main"), this will not pollute the SPN state of your installed Portmaster.
+
+7. Stop the test net
+
+This is important, as just stopping the `./run.sh` script will leave you with interfaces with public IPs!
+
+```
+./stop.sh
+```