Add interface skeleton

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "orsb"
+version = "0.1.0"
+authors = ["Alex Mikhalev <alexmikhalevalex@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/lib.rs

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+use std::marker::PhantomData;
+
+pub trait Message: 'static + Clone + Send + Sync {}
+
+impl<T> Message for T where T: 'static + Clone + Send + Sync {}
+
+pub struct Orsb {}
+
+impl Orsb {
+    pub fn new() -> Self {
+        todo!()
+    }
+
+    pub fn subscribe<T: Message>(&mut self) -> Subscription<T> {
+        todo!()
+    }
+
+    pub fn advertise<T: Message>(&mut self) -> Publication<T> {
+        todo!()
+    }
+}
+
+#[derive(Clone, Debug)]
+#[non_exhaustive]
+pub enum RecvErr {
+    Empty,
+    Closed,
+    Lagged,
+}
+
+pub struct Subscription<T> {
+    _phantom: PhantomData<T>,
+}
+
+impl<T: Message> Subscription<T> {
+    pub async fn recv_wait(&mut self) -> Result<T, RecvErr> {
+        todo!()
+    }
+
+    pub fn recv(&mut self) -> Result<T, RecvErr> {
+        todo!()
+    }
+
+    pub fn try_recv(&mut self) -> Result<T, RecvErr> {
+        todo!()
+    }
+}
+
+#[derive(Clone, Debug)]
+#[non_exhaustive]
+pub enum SendErr {
+    NoListeners,
+}
+
+pub struct Publication<T> {
+    _phantom: PhantomData<T>,
+}
+
+impl<T: Message> Publication<T> {
+    pub fn send(&mut self) -> Result<T, SendErr> {
+        todo!()
+    }
+}