Include README for Rust package as well; bump version to 0.30.1

Author: Qqwy

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "opsqueue_python"
-version = "0.30.0"
+version = "0.30.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

libs/opsqueue_python/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "opsqueue"
-version = "0.30.0"
+version = "0.30.1"
 edition = "2021"
 description = "lightweight batch processing queue for heavy loads"
 repository = "https://github.com/channable/opsqueue"

opsqueue/Cargo.toml

@@ -0,0 +1,22 @@
+Opsqueue is a lightweight batch processing queue system.
+
+This crate describes both the opsqueue queue binary, as well as the core of the various client libraries that can call it.
+
+## Installing the Opsqueue binary
+
+`cargo install opsqueue`
+
+## Using a client library
+
+Currently, we have high-level Python bindings available, c.f. [https://pypi.org/project/opsqueue/](https://pypi.org/project/opsqueue/).
+
+Besides this, the Rust client itself can be used directly, by including `opsqueue` as a library in your project's `Cargo.toml` and enabling the `client-logic` feature-flag:
+
+```toml
+opsqueue = {version = "0.30.0", default-features = false, features = ["client-logic"]}
+```
+
+## More info
+
+Find full usage instructions and details at the main repository readme:
+[https://github.com/channable/opsqueue](https://github.com/channable/opsqueue)