prepare config

Cargo.toml

@@ -37,7 +37,7 @@ async-trait = "0.1.40"
 hex-literal = "0.3.1"
 once_cell = "1.4.1"
 getrandom = "0.2.0"
-#serde_json = "1.0.57" # serde not suitable for our text formatting :/ maybe just use `cbor` -> base64 with text header? would be a PEM-like format. sounds good imo
 
 [build-dependencies]
 rustc_version = "0.2"
+config_struct = "0.5.0"

config/password.toml

@@ -0,0 +1,15 @@
+[password]
+length = 3
+message = "Not a safe password"
+
+[[password.deny]]
+message = "Password too alphanumeric"
+value = ["^[A-z]+$"]
+type = "regex"
+case-sensitive = false
+
+[[password.allow]]
+warn = true
+message = "Empty string password"
+value = [""]
+type = "exact"