add the README

Cargo.lock

@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "humantime_to_duration"
-version = "0.1.2"
+version = "0.1.3"
 dependencies = [
  "regex",
  "time",

Cargo.toml

@@ -1,10 +1,11 @@
 [package]
 name = "humantime_to_duration"
 description = " parsing human-readable relative time strings and converting them to a Duration"
-version = "0.1.2"
+version = "0.1.3"
 edition = "2021"
 license = "MIT"
 repository = "https://github.com/uutils/humantime_to_duration"
+readme = "README.md"
 
 [dependencies]
 regex = "1.7"