Move substrate-bridge-relay into repository (#1)

* Initial commit. CLI which parses RPC urls.

* Establish ws connections and make simple RPC requests.

* Complete bridge setup.

* Process subscription events.

* Ctrl-C handler.

* Write a bare-bones README and copy in design doc.

* Modularize code a little bit.

* Communicate with each chain in a separate task.

* Parse headers from RPC subscription notifications.

* Send (fake) extrinsics across bridge channels.

And now it's deadlocked.

* Fix deadlock.

* Clarify in README that this is not-in-progress.

* Move everything into a single folder

* Move Substrate relay into appropriate folder

* Get the Substrate Relay node compiling

* Update Cargo.lock

* Use new composite accounts from Substrate

* Remove specification document

It has been moved to the Wiki on the Github repo.

* Update author + remove comments

* Use latest master for jsonrpsee

Required renaming some stuff (e.g Client -> RawClient)

Co-authored-by: Jim Posen <jim.posen@gmail.com>

bridges/relays/substrate/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "substrate-bridge"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2018"
+
+[dependencies]
+async-std = "1.0.1"
+clap = "2.3.3"
+ctrlc = "3.1.3"
+derive_more = "0.99.1"
+env_logger = "0.7.1"
+futures = "0.3.1"
+jsonrpsee = { git = "https://github.com/paritytech/jsonrpsee", features = ["ws"] }
+log = "0.4.8"
+node-primitives = { version = "2.0.0", git = "https://github.com/paritytech/substrate" }
+serde_json = "1.0.41"
+sp-core = { version = "2.0.0", git = "https://github.com/paritytech/substrate.git" }
+sp-rpc = { version = "2.0.0", git = "https://github.com/paritytech/substrate.git" }
+url = "2.1.0"