update README

Author: patrick-ogrady

README.md

@@ -512,11 +512,13 @@ _Can use this to get the current fee rate._
 ## Running the VM
 To build the VM (and `spaces-cli`), run `./scripts/build.sh`.
 
-### Joining the public beta
+### Joining the Spaces Demo
 If you'd like to become a validator on the demo, reach out to @\_patrickogrady on Twitter
 after you've joined the network and synced to tip. Please send a screenshot
 indicating you've done this successfully.
 
+You can find the genesis used for the Spaces Demo in `networks/42`.
+
 ### Running a local network
 [`scripts/run.sh`](scripts/run.sh) automatically installs [avalanchego](https://github.com/ava-labs/avalanchego), sets up a local network,
 and creates a `spacesvm` genesis file. To build and run E2E tests, you need to set the variable `E2E` before it: `E2E=true ./scripts/run.sh 1.7.4`