feat: add zombienet config (#4)

Co-authored-by: Frank Bell <[email protected]>

networks/README.md

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+# Zombienet
+
+## Installation
+You can install the Pop CLI as follows:
+```shell
+cargo install --git https://github.com/r0gue-io/pop-cli
+```
+
+## Spawn Network
+You can spawn a local network as follows:
+```shell
+pop up -c ./networks/rococo.toml
+```

networks/rococo.toml

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+[settings]
+timeout = 1000
+node_spawn_timeout = 300
+
+[relaychain]
+chain = "rococo-local"
+default_command = "./bin/polkadot"
+
+    [[relaychain.nodes]]
+    name = "alice"
+    validator = true
+
+    [[relaychain.nodes]]
+    name = "bob"
+    validator = true
+
+[[parachains]]
+id = 909
+
+    [[parachains.collators]]
+    name = "pop"
+    command = "./target/release/pop-node"