Swap contract

Automated test runs and we guarantee to support these systems below:

Ubuntu 18.04 or later MacOS 10.14 or later

• Rust
• protoc >= 3.6.1
• make
• cmake

make setup
make build/swap-install

On the running blockchain node process nodef

clif contract run wasm ./swap_install.wasm '' 0.1 --from elsa

make test

• Swap process
• Method lists