rubicon mega-repo and playground

rubicon by example

x00-hello:
- purpose: hello world with noise
- client connects to server
- server writes back "hello"
- server closes connection
x01-noisy-hello:
- was going to be hello world over noise
- abandoned
x02-_:
- skipped because the 2 key on my laptop doesn't work
x03-echo:
- telnet echo server
- budget version of zx template "traditional erlang service application"
x04-noisy-echo:
- TUI chat client and daemon escripts
- tunnels connection over noise
x05-rq:
- rq = Rubicon querier
- has hardcoded contract address