Add a plugin skeleton for a Diopser port

plugins/diopser/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "diopser"
+version = "0.1.0"
+edition = "2021"
+authors = ["Robbert van der Helm <mail@robbertvanderhelm.nl>"]
+license = "GPL-3.0-or-later"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+nih_plug = { path = "../../", features = ["assert_process_allocs"] }