add simnet tests (#9222)

* add simnet tests

* add link to bracap presentation of simnet

* add link to bracap presentation of simnet

* rm not needed file

substrate/simnet_tests/configs/default_local_testnet.toml

@@ -0,0 +1,14 @@
+[settings]
+bootnode-domain-name = "bootnode.{{get_env(name="NAMESPACE")}}.svc.cluster.local"
+
+
+[settings.setup]
+timeout = 300
+
+[settings.defaults]
+timeout = 300
+
+[nodes]
+alice = { extra-args = ["--alice"], validator = true }
+bob = { extra-args = ["--bob"], validator = true }
+charlie = { extra-args = ["--charlie"], validator = true }