add Rosenpass, the tool

Initial implementation of the Rosenpass tool, implemented by @koraa.
Includes contributions and some lints from @wucke13.

Co-authored-by: wucke13 <wucke13@gmail.com>

Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "rosenpass"
+version = "0.1.0"
+authors = ["Karolin Varner <karo@cupdev.net>"]
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+[[bench]]
+name = "handshake"
+harness = false
+
+[dependencies]
+anyhow = { version = "1.0.52", features = ["backtrace"] }
+base64 = "0.13.0"
+clap = { version = "3.0.0", features = ["yaml"] }
+static_assertions = "1.1.0"
+memoffset = "0.6.5"
+libsodium-sys-stable = { version = "1.19.26", features = ["use-pkg-config"] }
+oqs-sys = { version = "0.7.1", default-features = false, features = ['classic_mceliece', 'kyber'] }
+lazy_static = "1.4.0"
+thiserror = "1.0.38"
+paste = "1.0.11"
+log = { version = "0.4.17", optional = true }
+env_logger = { version = "0.10.0", optional = true }
+
+[dev-dependencies]
+criterion = "0.3.5"
+test_bin = "0.4.0"
+
+[features]
+default = ["log", "env_logger"]