Add a dummy jack example

Signed-off-by: Nikolai Rodionov <allanger@badhouseplants.net>

Cargo.lock

@@ -26,6 +26,21 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "82b8f8f868b36967f9606790d1903570de9ceaf870a7bf9fbbd3016d636a2cb2"
+dependencies = [
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
+
 [[package]]
 name = "engine"
 version = "0.1.0"
@@ -59,6 +74,14 @@ dependencies = [
  "log",
 ]
 
+[[package]]
+name = "jack-sine"
+version = "0.1.0"
+dependencies = [
+ "crossbeam-channel",
+ "jack",
+]
+
 [[package]]
 name = "jack-sys"
 version = "0.5.1"