feat: with example code

Signed-off-by: kjuulh <contact@kjuulh.io>

Cargo.lock

@@ -538,6 +538,7 @@ dependencies = [
  "anyhow",
  "async-trait",
  "clap 4.4.4",
+ "crunch-codegen",
  "crunch-file",
  "thiserror",
  "tokio",
@@ -554,11 +555,15 @@ dependencies = [
  "bytes 0.4.12",
  "crunch-file",
  "crunch-traits",
+ "genco",
+ "pretty_assertions",
  "prost 0.12.1",
  "prost-build",
  "prost-types 0.12.1",
+ "tempfile",
  "tokio",
  "tracing",
+ "walkdir",
 ]
 
 [[package]]
@@ -888,6 +893,28 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "genco"
+version = "0.17.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6973ce8518068a71d404f428f6a5b563088545546a6bd8f9c0a7f2608149bc8a"
+dependencies = [
+ "genco-macros",
+ "relative-path",
+ "smallvec",
+]
+
+[[package]]
+name = "genco-macros"
+version = "0.17.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c2c778cf01917d0fbed53900259d6604a421fab4916a2e738856ead9f1d926a"
+dependencies = [
+ "proc-macro2 1.0.67",
+ "quote 1.0.33",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -1604,6 +1631,12 @@ version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dbb5fb1acd8a1a18b3dd5be62d25485eb770e05afb408a9627d14d451bae12da"
 
+[[package]]
+name = "relative-path"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c707298afce11da2efef2f600116fa93ffa7a032b5d7b628aa17711ec81383ca"
+
 [[package]]
 name = "ring"
 version = "0.16.20"
@@ -1907,6 +1940,17 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2 1.0.67",
+ "quote 1.0.33",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.37"