Add empty coordinator

coordinator/Cargo.toml

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+[package]
+name = "coordinator"
+version = "0.1.0"
+description = "Serai coordinator to prepare batches and sign transactions"
+license = "AGPL-3.0-only"
+repository = "https://github.com/serai-dex/serai/tree/develop/coordinator"
+authors = ["Luke Parker <lukeparker5132@gmail.com>"]
+keywords = []
+edition = "2021"
+publish = false
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
+[dependencies]
+tokio = { version = "1", features = ["full"] }

coordinator/LICENSE

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+AGPL-3.0-only license
+
+Copyright (c) 2023 Luke Parker
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License Version 3 as
+published by the Free Software Foundation.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.

coordinator/README.md

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+# Coordinator
+
+The Serai coordinator communicates with other coordinators to prepare batches
+for Serai and sign transactions.
+
+In order to achieve consensus over gossip, and order certain events, a
+micro-blockchain is instantiated.

coordinator/src/main.rs

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+#[tokio::main]
+async fn main() {}