document hot_lib for developers a bit

Signed-off-by: strawberry <strawberry@puppygock.gay>

Cargo.lock

@@ -567,6 +567,7 @@ dependencies = [
  "hickory-resolver",
  "hmac",
  "hot-lib-reloader",
+ "hot_lib",
  "http 1.1.0",
  "http-body-util",
  "hyper 1.3.1",
@@ -575,7 +576,6 @@ dependencies = [
  "ipaddress",
  "itertools 0.12.1",
  "jsonwebtoken",
- "lib",
  "log",
  "loole",
  "lru-cache",
@@ -1347,6 +1347,10 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "hot_lib"
+version = "0.1.0"
+
 [[package]]
 name = "html5ever"
 version = "0.26.0"
@@ -1797,10 +1801,6 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
-[[package]]
-name = "lib"
-version = "0.1.0"
-
 [[package]]
 name = "libc"
 version = "0.2.153"